The problem is more likely caused by something else. The right part of the VR image is missing, so perhaps your mobile phone screen resolution is not recognized correctly. What device do you have? Does the full screen mode with VR disabled work correctly?
If you look at the screenshots from other VR engines, right eye often shows more stuff on the left side than the left eye (and vice versa):
https://www.google.pl/search?q=vr+screenshot&source=lnms&tbm=isch
Some examples below:
I’m not sure what is a good explanation for this. I guess it may be because not everything on the screen is visible with the VR headset on, so it doesn’t matter what is rendered near the borders of the image.