Don't know if that's the same issue, but my map selection screen sometimes starts to lag like this too - and no, "absolute scrolling" is turned off when this happens. You also can't select any of beatmaps with mouse, only selection with keyboard works. Returning to title screen and back doesn't help, playing a beatmap sometimes does, but sometimes not; restarting a game helps. I never managed to reproduce it when I tried to, but it just keeps happening when I need it the least - while hosting a multiplayer match, for instance. Doesn't happen very often, but it's really annoying.
Upd: forgot to provide some details. My beatmap list doesn't scroll down when this happens, but behaves as if "absolute scrolling" was on (Again, I'm 100% sure it's OFF.) Also, when that happens, Hover Return does not brings you to selected map - it just throws you somewhere randomly.