Adding Products to Shop

I’m using WordPress for an online store for the small business I work for. I keep trying to add items to the shop, but the images are only showing up on the right side bar area once they’re published. When you click on “shop” there is a thumbnail of what’s supposed to be there but it doesn’t load. Then when you click on that item, there is no main image, just the on on the right side. I’m new to this, so this is probably a dumb question, but it is so frustrating! How can I get the images to show up?