Sprite layers - can't figure out why 1 arm is hidden

[Tirimiru]

Hi,

So I've already done a lot of research - I know that changing the z-orders in Spriter or re-positioning will not affect how it's shown in game. I used the hair section to get her long hair to show at the back. But I'm not understanding why her left arm is showing behind her hair in game. I'd like to know where the layer ordering is even initialized to affect it in-game. Even remaking the whole scml project does not work as intended and has major underlying issues.

Please advise on this, I can't find any clear solution from past threads.

Thank you in advance