Head turner : head is detaching from the body

Hello! I created a puppet with a head turner, but wenn ich tilt my head, the head of my puppet does not tilt, but is detaching from the body. The head layer is not independent, but the "frontal" "quarter" and "profile" layer are independent. is that the reason ? how can i solve it? thank you!

ps i scaled down Head Tilt and Head Position Strenght already, but i did not solve the problem..