I appreciate the screenshots that you have added and providing the online store URL. Looking into this, it looks like you have apassword protection pageon the online store so I am unable to view the product images. You can remove the password protection page on the store by navigating to Online store > Preferences > Password protection. Just gather some additional context, have you made any custom coding changes to the theme? I would suggest making sure that the images that you are using for the products are clear and easy to view.
Looking forward to your reply.
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