Featured Image Not Appearing Thumbnails Opening New Page

Hello,

I just updated to 1.2.5.6 and all my product pages are now ‘broken’. I no longer have featured images and cannot figure out how to get them back in. I have inserted featured images on the side panel and uploaded images into the a3 gallery box and selected featured without success.

Also all the thumbnails now link to separate page of just the image rather than appearing in the gallery box (which doesn’t appear).

Please help. Thank you!

https://www.steviehowell.com/shop/bryony-redmodal-scarf/

All shop images experienced this effect after update. This product is the one I have tried to fix.

https://www.ads-software.com/plugins/woocommerce-dynamic-gallery/