Okay,
i've avalized it more deeply and it seems that white space is generated when a table specification is scraped.
There are two workarounds – either set a regex in each text field (which is really time consuming and isn't perfect cause some of them contain words and numbers), or setup a script in Tampermonkey extension to remove white space inside every text field in a table when it's scraped.
There's also a third workaround — just copy and paste results from results window, as it doesn't show white space.
P.S. not forgetting the working sitemap:
{"_id":"icon-idealo2","startUrl":["https://www.idealo.de/preisvergleich/ProductCategory/9192.html?q=led"],"selectors":[{"id":"clicker","type":"SelectorElementClick","selector":"div.resultlist","parentSelectors":["_root"],"multiple":true,"delay":"2000","clickElementSelector":"a.pagination-next","clickType":"clickMore","discardInitialElements":false,"clickElementUniquenessType":"uniqueText"},{"id":"Titel","type":"SelectorText","selector":"h1.oopStage-title span","parentSelectors":["LinkToProduct"],"multiple":false,"regex":"","delay":0},{"id":"Typ","type":"SelectorText","selector":"span.oopStage-productInfoTopItem a","parentSelectors":["LinkToProduct"],"multiple":false,"regex":"","delay":0},{"id":"Preis","type":"SelectorText","selector":"li.productOffers-listItem:nth-of-type(1) a.productOffers-listItemOfferPrice","parentSelectors":["LinkToProduct"],"multiple":false,"regex":"","delay":0},{"id":"Beschreibung-1","type":"SelectorElementAttribute","selector":"span.oopStage-productInfoTopItem span.energy-label","parentSelectors":["LinkToProduct"],"multiple":false,"extractAttribute":"title","delay":0},{"id":"Beschreibung-2","type":"SelectorText","selector":"span.oopStage-productInfoTopItem:nth-of-type(3)","parentSelectors":["LinkToProduct"],"multiple":false,"regex":"","delay":0},{"id":"Beschreibung-3","type":"SelectorText","selector":"span.oopStage-productInfoTopItem:nth-of-type(4)","parentSelectors":["LinkToProduct"],"multiple":false,"regex":"","delay":0},{"id":"Beschreibung-4","type":"SelectorText","selector":"span.oopStage-productInfoTopItem:nth-of-type(5)","parentSelectors":["LinkToProduct"],"multiple":false,"regex":"","delay":0},{"id":"Beschreibung-5","type":"SelectorText","selector":"span.oopStage-productInfoTopItem:nth-of-type(6)","parentSelectors":["LinkToProduct"],"multiple":false,"regex":"","delay":0},{"id":"table","type":"SelectorElementClick","selector":"div.overlay-contentWrapper","parentSelectors":["LinkToProduct"],"multiple":true,"delay":0,"clickElementSelector":"span.oopStage-productInfoTopItemWrapperDatasheetLink a","clickType":"clickOnce","discardInitialElements":false,"clickElementUniquenessType":"uniqueText"},{"id":"LinkToProduct","type":"SelectorLink","selector":"div.offerList-item a.offerList-itemWrapper","parentSelectors":["clicker"],"multiple":true,"delay":"2000"},{"id":"id1","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(1) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"\\w+","delay":0},{"id":"res1","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(1) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"\\w+","delay":0},{"id":"id2","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(2) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"\\w+","delay":0},{"id":"res2","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(2) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id3","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(3) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"\\w+","delay":0},{"id":"res3","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(3) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id4","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(4) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res4","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(4) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id5","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(5) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res5","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(5) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id6","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(6) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res6","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(6) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id7","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(7) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res7","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(7) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id8","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(8) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res8","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(8) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id9","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(9) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res9","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(9) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id10","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(10) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res10","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(10) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id11","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(11) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res11","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(11) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id12","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(12) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res12","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(12) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id13","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(13) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res13","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(13) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id14","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(14) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res14","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(14) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id15","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(15) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res15","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(15) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id16","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(16) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res16","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(16) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id17","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(17) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res17","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(17) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id18","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(18) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res18","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(18) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id19","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(19) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res19","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(19) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id20","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(20) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res20","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(20) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id21","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(21) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res21","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(21) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id22","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(22) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res22","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(22) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id23","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(23) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res23","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(23) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id24","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(24) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res24","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(24) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id25","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(25) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res25","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(25) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id26","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(26) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res26","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(26) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id27","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(27) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res27","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(27) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id28","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(28) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res28","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(28) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id29","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(29) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res29","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(29) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"id30","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(30) span.datasheet-listItemKey","parentSelectors":["table"],"multiple":false,"regex":"","delay":0},{"id":"res30","type":"SelectorText","selector":"div.overlay-content li.datasheet-listItem:nth-of-type(30) span.datasheet-listItemValue","parentSelectors":["table"],"multiple":false,"regex":"","delay":0}]}