I see that you have made a lot of changes in the child theme including cart files and header.php files that causes fatal error by the way https://prnt.sc/1s5xxv6
With the parent theme everything works fine https://prnt.sc/1s5yl3q
So, check your child theme files that you customized to find which one causes the error and fix that. Theme author is not responsible for code changes that the user made in the child theme.
Besides I have tried to add product gallery images and did not see any issue with the gallery https://www.pipaton.com/ch-en/product/n-93-black/
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.