There is some kind of issue displaying variation images. We added different variation images for multiple products but those don’t display on the product page (once we select variation on the product page it shows white screen in place of the variation image we just added).
Please make the full backup of your site as well as the Theme settings export and check the issue on the Storefront theme to detect if our theme causes the problem. Storefront is a free theme developed by WooСommerce.