I have a problem with the clipping mask

So the shadow under the chin is going wonky. I don't know (hard to work out from screenshots alone). Is the shadow one big shape or multiple strokes?

I was looking on the left side of the screenshot. I was trying to understand if the shadow was one object or multiple. It reminded me a bit of upper and lower arm problems with everything in the same layer, causing Ch randomness. Separating layers and grouping better to help Ch decide what goes in front of what (e.g. splitting forearm artwork from upper arm artwork) is what I was wondering about. But pure guesswork.

For these sorts of cases, I often export puppet, import it again (to have a copy that is safe to destroy), then start deleting things (eyes, nose, etc) in Ch that should not impact it (and Undo if needed!). Thin the puppet down to the minimal layers and behaviors where it still fails. Sometimes that helps identify the source of the problem.