Hi, I have one like that too, but so long as there is only one listing on eBay (an item listed multiple times would have different eBay numbers for each) then I am not bothered about it. Only one eBay fee would have been paid and anyone clicking on either in my Auctiva store would end up at the same listing.
I think this is a hiccup with Auctiva and filing a support request should get it fixed.
Sure I have seen others with this recently.