>>289642832
I don't know if it still works, but you can maybe use https://github.com/Xiexe/XSBones to make your entire armature visible in game, so you can see how it's actually moving. For actually fixing the issue, I don't know what changes you actually need to make though. https://www.youtube.com/watch?v=2sfTEBAl8sA has a bunch of fixes for similar-but-not-exactly-the-same issues, might be helpful.