I build the app for ODG R7 with Unity 5.5 and Vufori 6.2. The first scene is a basic UI with some buttons. No Vuforia.
Clicking one of the buttons loads a new scene with Vuforia system, all goes well. It is basically a simplification of the ImageTargets scene from the samples (only one target and different model).
Now when I get back to initial scene, the whole UI seems to be offset between the two eyes. There is no leftover of Vuforia in that scene.
I can have it all well as long as Vuforia is not started. If I try to add some UI items to the Vuforia scene, they will show as double as if each eye is not sync (it shows fine if I shut one eye so it is offset between the two eyes).
I do not have VR enabled in Unity as it works out of the box with basic Android apk.
It works fine in Editor, it is only screwing up when running on the device.