I'm using the Android App v1.0.29 on a HTC One with Android 4.4.2, and I've noticed there's a little quirk in scrolling the question list: if I scroll almost to the top of the list, I won't be able to scroll up anymore - instead, dragging down will activate the refresh like I'm already at the top and there's nothing more to scroll. I run into this surprisingly often when scrolling back up through the list.
I'll illustrate through screenshots. Take note of the position of the top two questions in this screenshot of SO:
Scroll down, then back up again. Make sure the search bar pops out. Stop exactly so that slightly less than half of the top question is hidden behind the search bar. Remove your finger from the screen entirely.
Now try to scroll up again: in this case, I can't scroll and instead I'll be activating the refresh.
Another quirk that I don't run into often - but might help the devs understand what's going on - is that the same happens if I scroll down just a tiny bit in order to cover any portion of the search bar (but not all of it).