The variation selectors have to be nested under one another. The correct selector can be found by inspecting the HTML.
{"_id":"bigbanner-com","startUrl":["https://bigbanner.com.au/product/acrylic-fabricated-led-circle-light-box/"],"selectors":[{"clickActionType":"real","clickElementSelector":"[name=\"attribute_size\"] option:not(:contains('Choose an option'))","clickElementUniquenessType":"uniqueCSSSelector","clickType":"clickOnce","delay":1000,"discardInitialElements":"discard-when-click-element-exists","id":"select-size","multiple":true,"parentSelectors":["_root"],"selector":"body","type":"SelectorElementClick"},{"clickActionType":"real","clickElementSelector":"[name=\"attribute_graphic\"] option:not(:contains('Choose an option'))","clickElementUniquenessType":"uniqueCSSSelector","clickType":"clickOnce","delay":1000,"discardInitialElements":"discard-when-click-element-exists","id":"select-graphic","multiple":true,"parentSelectors":["select-size"],"selector":"_parent_","type":"SelectorElementClick"},{"id":"price","multiple":false,"parentSelectors":["select-graphic"],"regex":"","selector":".rightpress_product_price_breakdown_subtotal span.woocommerce-Price-amount","type":"SelectorText"},{"id":"size","multiple":false,"parentSelectors":["select-graphic"],"regex":"","selector":"[name=\"attribute_size\"] option:selected","type":"SelectorText"},{"id":"graphic","multiple":false,"parentSelectors":["select-graphic"],"regex":"","selector":"[name=\"attribute_graphic\"] option:selected","type":"SelectorText"}]}