Tracks won't stay panned

So I'm using Pro Tools 10 with a M-Audio Fast Track USB to mix some tracks and in Pro Tools when I pan any of the tracks and then hit play, they won't stay panned, they just un-pan as soon as it starts to play. I have checked the switch on the front of the Fast Track and it's in stereo. I have checked the I/O's in Pro Tools and the Fast Track Interface Software (there were no options just the buffer size of it). So I don't what else to do, I've never had this problem before and it's kinda irritating...actually really irritating.