Could you check if all the links for inside the database of your website as well as all the hard-coded links are configured to load via https protocol?
Please, describe to us your problems in a bit more details. Attach some screenshots and provide us with a list of steps on how to reproduce it on your website.
But our theme doesn’t affect your URLs and we can’t replace all links in the database. You need to walk through your content and replace them manually or do this with some SQL queries but we don’t have an instruction for this.
At any single product page, it is fetching http image for my trust badges before and after add to cart button and size guide image , also some CDN image?