Hello,
Looks that shop thumbnails images are missing http://prntscr.com/q54e47
Try to regenerate thumbnails. Actually, your site (backend and frontend) is so slow for us that we can’t even open single product or product categories from backend. You keep enabled 89 plugins, OMG. Check the plugins list and disable those you don’t really use, hope you know that every additional plugin slows down site and takes server resources.
Regards