I have never come across this before.

Every-time I make a change in Edit-mode, then press tab to return to object-mode, that change I had just made is undone, automatically. No matter what I tweak, I can't fix the issue.

This only happens when I make a change in edit mode and then go to object mod. I cannot get the new change to the model to actually stay.

and when I do something in object mode and switch to edit mode and then back, the change in object mode stays!?

makes no sense.

Than why dont you just make a useless unnoticable change then?