Rotation error for arms (Blender to Unity)

Hello guys,

I made a cubic guy in blender and armature for that. Then I made a walk animation and 3 aim animation (Up down and forward we can say). In blender it looks great but when I use these animations in Unity arm rotations change. Here some ss to show the problem. This is how it looks in blender:
And when I import this to Unity, it becomes something like this


I believe you guys can see the difference between upper arms. Does anyone know how to fix this problem ??

 

Disclaimer: Not a Blender user.
May need to bake the animation if you animated the arms using IK. Supporting info - The character looks like he is standing more upright in Unity. If IK targets were used in blender and the animation was not baked out - the IK key info may not be getting read into Unity correctly.

 

I realised that If I use Generic in the rig option everything is exactly how it should be. But if I use humanoid this happens.