That's normal. Your surgeon moved the bone and cut some tissue. It all needs to stretch out and you need to relearn to use it. Sometimes people have trouble speaking and swallowing even. I don't know that your habits are significant but that's the nature of relapse, it's a tug of war between the bones and soft tissue until it heals. After that, it can remodel too. It can happen in the joint as well, even though it wasn't operated on. Your surgical plan had some flexibility here, bigger movements are less stable and certain kinds of movements are less stable. Past that and surgeon instructions, it just comes down to odds. Relapse happens.