Bone glitch mess

[AiTechEye]

Trying to fix the anoying glitch that turns the character's hats upside down.
The thing is it turns wrong when the head is not rotating while standing.

for some reason i fixed its backpack glitch/jumping by change the body bone roll from 0.000014 to 0.00001
but doesn't seems to work for the head..

the model was created in blender 2.7, edited in 2.8, didnt work in 2.7 anymore, now using in 2.9 that i fixed problems.


any idea?


Edit:
found a dirty solution: set the rotation to 0.01, doesn't glitch but this is still a problem

[runs]

My Samz suffer from the same problem.