[MAYA 2015] Animation change curves on FBX export.

Hi, I recently meet this problem:
If “bake animation” is enable and If I export in FBX file, When I open the animation in Unreal by importing the FBX file, the animation changed curves.

I’m not finicky, the movement are blatantly different!
I baked animation because it uses the IK handle parented with a stick, and then,
both the hands should follow exactly the stick.

Some help?