Export to Unity via Victor Soupday's amazing converter look fantastic. It's a quantum leap forward with Unity connectivity.
Within Unity with Game Creator, I get a bent-knee resting posture at runtime. Might there be a solution or adjustment possible to correct this?
Altering the collider capsule works for a moment, then the legs bend again, as if the upper body is heavy.

Image 1: in Scene view before run.
Image 2: at runtime

 77% of original size (was 656x19) - Click to enlarge77% of original size (was 656x19) - Click to enlarge