Did you relist these items using Auctiva? If you did, even if you uploaded your images to Auctiva, the relisted auction will contain your old html info.
I know because I just went through this. I relisted items through Auctiva that I had previously listed through Vendio, and even though the pictures showed up in Auctiva...I had to go in and edit the html in each listing with the new Auctiva image code.
Just an idea...hope it helps!