As I suggested in my story this is probably just one of Cet's tricks. After all he is not much of a challenge when one finally encounters him, so he has to resort to bugs to make one tired of the game before the final battle.
I have also encountered the problem, but I have always been able to wriggle out of it. Actually it always happens with one of the trolleys in the Stout Mine. The party is dragged through the floor on one of the steep inclines, but the trolley drags the character through the glitch every time.