default category

Hi.
This question is about theme Auctionpress. At first it was working fine with the categories but now it always chooses the default category. When you submit a new auction and select your category it doesn’t take… automatically it chooses the default category which is chosen in the General Settings. I tried different things but couldn’t fix this bug… I think it happened after i deleted all the sample auctions and started to upload new ones and then i didn’t choose different categories. I choose the first one and this one was the default one as weal.

Thanks in advance for any help….