Point being, on other devices, the animation is like it should be. Only on the GS3 does it do this. I doubt it's the intention of CM, and is in fact a bug. Probably something to do with Trebuchet doing something screwy.
If it's a bug, then pull a logcat and submit to CM. I've not seen this as a bug, but as a part of the evolving nightlies. Just my opinion, though.