Getting null vales for some data s , please help me

i am trying to scrape following category , i am getting "null" data for some feld values i dont no why it happens for some datas only. in this site product detail page has two "click
element" values ( "phone number" and "description /read more/" ). can some one please guide me what is the bug in this site map ?

Url: https://ikman.lk/en/ads/sri-lanka/mobile-phones

Sitemap:
{"_id":"ikmancategery","startUrl":["https://ikman.lk/en/ads/sri-lanka/mobile-phones?page=[1-2]"],"selectors":[{"id":"links","type":"SelectorLink","parentSelectors":["_root"],"selector":"a.gtm-ad-item","multiple":true,"delay":0},{"id":"District ","type":"SelectorText","parentSelectors":["links"],"selector":"div:nth-of-type(3) div.ellipsis--1NS5-","multiple":false,"regex":"","delay":0},{"id":"city","type":"SelectorText","parentSelectors":["links"],"selector":"div:nth-of-type(4) div.ellipsis--1NS5-","multiple":false,"regex":"","delay":0},{"id":"categery","type":"SelectorText","parentSelectors":["links"],"selector":"div:nth-of-type(6) div.ellipsis--1NS5-","multiple":false,"regex":"","delay":0},{"id":"title ","type":"SelectorText","parentSelectors":["links"],"selector":"h1","multiple":false,"regex":"","delay":0},{"id":"dealer-name","type":"SelectorText","parentSelectors":["links"],"selector":"div.ellipsis--3FPDI","multiple":false,"regex":"","delay":0},{"id":"contact","type":"SelectorElementClick","parentSelectors":["links"],"selector":"div.display--s3dc8:nth-of-type(1)","multiple":true,"delay":"500","clickElementSelector":"button.contact-section--1qlvP","clickType":"clickOnce","discardInitialElements":"do-not-discard","clickElementUniquenessType":"uniqueText"},{"id":"phone-no","type":"SelectorText","parentSelectors":["contact"],"selector":"div.phone-numbers--2COKR:nth-of-type(1)","multiple":false,"regex":"","delay":0},{"id":"thumbnail-image","type":"SelectorImage","parentSelectors":["links"],"selector":".selected-image--2wQ2F img","multiple":false,"delay":0},{"id":"Price","type":"SelectorText","parentSelectors":["links"],"selector":"div.amount--3NTpl","multiple":false,"regex":"","delay":0},{"id":"Condition","type":"SelectorText","parentSelectors":["links"],"selector":"div.two-columns--19Hyo:nth-of-type(1) div.value--1lKHt","multiple":false,"regex":"","delay":0},{"id":"Brand","type":"SelectorText","parentSelectors":["links"],"selector":"div.two-columns--19Hyo:nth-of-type(2) div.value--1lKHt","multiple":false,"regex":"","delay":0},{"id":"Model","type":"SelectorText","parentSelectors":["links"],"selector":"div.two-columns--19Hyo:nth-of-type(3) div.value--1lKHt","multiple":false,"regex":"","delay":0},{"id":"Edition","type":"SelectorText","parentSelectors":["links"],"selector":"div:nth-of-type(4) div.value--1lKHt","multiple":false,"regex":"","delay":0},{"id":"Features","type":"SelectorText","parentSelectors":["links"],"selector":"p.text--Xap4O","multiple":false,"regex":"","delay":0},{"id":"Description","type":"SelectorElementClick","parentSelectors":["Description"],"selector":"div > div.description--1nRbz","multiple":true,"delay":"500","clickElementSelector":"button.expander--PzBP6","clickType":"clickOnce","discardInitialElements":"do-not-discard","clickElementUniquenessType":"uniqueText"},{"id":"more-discription","type":"SelectorText","parentSelectors":["Description"],"selector":"ul div.description--1nRbz","multiple":false,"regex":"","delay":0},{"id":"description","type":"SelectorElementClick","parentSelectors":["links"],"selector":"div.description-section--oR57b","multiple":true,"delay":"500","clickElementSelector":"button.expander--PzBP6","clickType":"clickOnce","discardInitialElements":"do-not-discard","clickElementUniquenessType":"uniqueText"},{"id":"morediscriptions","type":"SelectorText","parentSelectors":["description"],"selector":"p","multiple":true,"regex":"","delay":0}]}

Most of your selectors will eventually fail because the site uses random chars in classes like div.ellipsis--3FPDI

You will need much better selectors, e.g. for Dealer, it should be something like:

div[data-testid='member-details'] div[class*='contact-name']

Ref: https://www.w3schools.com/cssref/css_selectors.asp