VR Recenter only Y Axis?

I use "UnityEngine.VR.InputTracking.Recenter();" to recenter the Oculus Rift view.
But it only recenter the Y axis, not X and Y.

Is that a bug or is there a solution for this?

Unity 5.3.4f1
Oculus 1.10 (SDK 0.8.0.0)