ok and the wobbling is from only having 3? anyway..

It sounds like a few of the class members need to politely inform the administration of a possible COGNITIVE problem with the old prof, eh?

They may have had doubts when they rehired him, but if no one complains, legitimately, then they will let it ride... it's tougher to find competent profs than to let one with credentials stay...

I had a private talk with one prof who completely reversed the concepts of deductive and subjective thinking! He would then ask me questions, in another room, about the next class... sheesh. Easy A. I also have spoken to another prof for a friend's prof who was misinstructing an English class in some basic grammar. (after endless arguing with my friend!) and let THAT professor correct the other...
(already had an A) Will either of these help you?