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Odd distortion in Blender FBX exported animation

So, I was busy developing a passion game, and BAM.

FBX exported animation seems to be causing a distortion at the legs of my mesh @

https://i.imgur.com/U8N7GOd.png

The animation is perfectly normal in blender and in the default t-pose that he was imported in.
See video for more information:
https://youtube.com/watch?v=XDUh5_pZDvU

Am I exporting something wrong, or am I importing something wrong?
Not sure if it makes any difference, but I have Force Root Lock on my animation.