So I've been trying to add this hair to deng's haku model for the past couple hours,, and it works fine, except for the fact that (what I assume to be) the neck bones are messed up when I insert motion data. The model runs fine without hair// the model w/ deleted hair, so I' m not sure what the problem is?

w/o hair

w/ added hair

Is the extra uhh idk,, where the old hair was, is this the problem?