Camera fixation

I am working with the unity OVR integration and I am currently animating a human body with the OVRcamera as the head. Headtracking works perfectly fine in combination with a walking animation for example. However, when it switches animations to the same person walking around with a light in front of him, the OVRcamera focuses on the hand and the hand remains the center of the screen regardless of the headtracking orientation. I did not succeed in isolating the reason why this fixation happens. Any ideas?
Thanks in advance