defect on the product page

I checked your page and found the issue. The issue is with your theme, so you will have to contact them for a fix.

My explanation is a bit technical but it is meant for the authors of your theme. Please send them this info so they can fix it.

Your theme (Kidsy) is wrapping the everything in the “cart” form in a “quantity-button” container. Here is a screenshot of the source code of your site showing this: https://i.snipboard.io/kihNEv.jpg

I am not sure why they are doing this but they should not do it this way.