that is odd, I don't think its nothing your doing wrong, as your Auctiva store categories are made when you insert your item to an Ebay category. As i am writing this I went to my store, and click on one of my categories and all the other ones went away, so I think is just something wrong with Auctiva, we must understand its free for one, and its in its early stages. Its really not a Big deal, because you still can go through your items just by clicking next from your home page.