FIX: YOU CANNOT ASSIGN A ROOT BONE for any part of the 360 head as a spring bone (ie. hair, earrings, pony tails, cheek whiskers, etc). YOU MUST leave the root bone as a non-spring bone or it will bug out. You can assign sub-bones to the root bone as spring bones, but not the main root bone of the sprite. So when you are putting spring bones on head pieces, leave the main root bone of the piece you are adding a spring bone(s) to OUTSIDE of any spring bone inclusion.
Found a work around fix. This was the same issue I had during BETA testing. https://youtu.be/8tfyT89_79A You cannot assign a ROOT bone of any object in the 360 head as a spring bone. You MUST leave the root bone as a non-spring bone or this but will occur.