Well it has happened to me to but the only way i know how to fix it is to start a new save It is quite annoying but if the bug keeps happening you might want to install the game again hope that helps:)
Ah, I'd rather just play a different game, I don't want pay for a game where it's so easy to just ruin your save file, and this bug has been around for a while since I've seen other comments complaining about it.
