Funny latency with M-Audio Mobile Pre USB

Hi,

I'm using an M-Audio MobilePre USB interface with Garageband, and I'm 99% certain that GB is doing something funny with latency. I'll record a clip, finish recording, and it'll do some funny compensation where it assumes that there is latency there where there is none, so it shifts the clip left by a few milliseconds (enough to sound sloppy). In every case where I record from the Mobile Pre USB, I find that if I shift the clip right by a few ticks, it'll sound like it did when I was recording it. Is this a known issue, and, if so, is there any way to calibrate it? Otherwise I'm left manually adjusting clips.

Thanks!