I’ve run into this issue before but my memory is a little foggy. You can fix it in Maya by turning off the property that adjusts the scale on bones. In Maya, this will cause the character’s bones to switch to its ‘true’ unaltered size. I’m surprised this did not cause any issues in Unity as well because it doesnt support that feature either. It will give Mecanim fits from what I recall. But the legacy animation system supports it apaprently
edit- Btw nice screenshots!