My puppet was working just fine the other day but I did add a ton of different layers, although I don't remember editing the face specifically.
Now when I try to turn my face left or right the puppet's face distorts, I have the image attached.
I've checked the hierarchy and everything seems right and I don't think I made any changes there when I added the new layers.
Hello. I was having the same issue. The left side of the face was drooping down when I lowered my head. I figured out that if I turned ON all of the attachment crowns within the Head group, the drooping stopped and the issue was fixed. Hope that helps!