Arni, are you clicking the "remember me" box?
Not each time I come here as I usually don't have to log in, but I do have it checked if that's what you mean...it does remember me, and it's been a long time since I've had to log in. Is that the box you mean?
I do assume it's a database error of some sort...it just seems odd that it has somehow incremented the thread count without posts. I know polls give phantom posts, but here's a postless thread!