Open a feed (I'm mainly offline; don't know if it happens online too) and, because button-scrolling is so %@#ing tedious, tap in the scroll bar to jump by a screenful.
Inevitably, the feed jumps back to the top! I can be 1/4th., 1/2, 9/10ths through, and for some damned reason it leaps back to 0!
This happened in OS 2005 too -- in the above manner and by trying to hit the Read Later checkbox.
Yep, it does it to me sometimes as well. I just wish they'd fix the freaking slow scrolling in the thing. It's just one of those apps that never got any attention when it came time to update. Too bad, I would really like to use it more. For now I'm stuck with using Bloglines and no stable offline solution.