Dear Jucy Leo,
I agree that the torque and pitch results do not look correct for the NREL 5-MW turbine.
From your post, it sounds like you have developed your own control strategy. The problem seems to be related to this controller, so, I think you’ll need to debug the problem yourself.
If you’d rather use the controller NREL has developed for the 5-MW reference turbine, please see the post found here: FAST.
I hope that helps.
Best regards,