Viewport rendering incorrect when switch from AR to VR Vuforia 6.2.10 Unity 5.4.2f2

Hi,

I need help about this issue:

If I try the AR/VR sample all run correctly on iOS 10 BUT in that sample the switch is in the About scene, then unless AR initialized.
My app run in AR and when I focus a marker I shows a button to switch to the VR, this is the screenshot about the viewport rendering:


View attachment 228842

The viewport is not in stereo mode, the gaze isn't centered and there isn't any settings for the cardboard.
In the Digital Eyewear settings I use Video...

Viewport rendering incorrect when switch from AR to VR Vuforia 6.2.10 Unity 5.4.2f2