Assignment

One particular teacher keeps getting emails notifying uploads by a student that should have gone to a different teacher.

I've checked everything I can think of: the student enrollments are all correct, the teachers are on the correct courses, the students aren't on any of the courses that the the other teacher is on, etc.

I'm now at a complete loss.  Is anyone else experiencing similar problems?  Or does anyone have any ideas as to what may be happening?