I thought I had that same problem too. Put the check mark, hit delete.... sounds so simple, right? Well, why aren't they gone then?
I think Auctiva has three different sets of lists for the same item: imported (item closes on eBay), closed (same as above), and saved (the original of the listing.)
Does that mean it needs to be deleted 3 times? I have gone over the same listings, over and over, only to find they reappear. Images are a bit iffy, as well.... SO it seems to me, SOME of us have problems doing things the same way as others, who don't have any trouble at all, and they think we are crazy!
I spend an awful lot of time doing maintenance on my Auctiva listings; it's a good thing I don't have a life. Good luck, all of you. b