Chrome on Android does that. I hate it. Whenever I scroll a line or two too far and want to scroll back, I have to go twice as far because the chrome decides to come back. I would welcome an alternative though.

It is actually a bit worse than that. The Chrome display changes on scroll also fire a window resize event, causing pages that use this information to reflow when you just scrolled. I suppose they were thinking people don't ever size anything based on window height?