The chin horns are flying up to the middle of the head because you are parenting them to the head.

Let me open Poser up and see if I can find a solution for you.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi