Not necessarily super easy to tell based on the screenshot, but if this is one of the things where they scale/pose fucks up and gets squished when you paste over the file, I've been able to reliably mitigate it by making sure you set "Apply Scalings: FBX All" when you export from Blender.

[RP] Why do you doubt me when I think the world of you..

Joceanographer?

99% of programmers stop just 1 printline before finding their bug.