Images only appear after hovering. HELP!!

I am using the Wootique theme and have been for years. First off, here is my site for you to see what I am talking about. https://www.cincycardsandsupplies.com

When you are on the main page, some images may show up. When you hover over them, they magically appear. It does this same thing in the shop as well. On mobile, when pics dont appear and you turn your phone to landscape, they show as well. Does anyone have any clue as to what may be causing this? I have been spinning my wheels for a while now. PLEASE HELP! Thank you