Hello,
Take our apologies if you faced any inconvenience using our theme. We are sure that all the mentioned issues are not related to our theme but to the third-party plugins that you use for image optimization or for the single product. Could you try to disable all the third-party plugins that do not come bundled with our theme and then enable them one by one to find ou which one is the reason of the problem? Or please, provide us with temporary WP Dashboard access to check it in more detail and help you ASAP.
Regards