Why has this double image been placed on the page?

I’m starting to believe that MarketPress is just incompatible with the Weaver II theme with all the problems that are occurring.

Here is the latest one. I created a product category for my pet urns that I turn. I started to add the individual products the same way I did for my hummingbird feeders and different kinds of pens. But as soon as a pet urn is added a double image appears.

How do I stop this from happening? I haven’t changed any settings before starting to add these urns.