Wrong NeckToEye distance for GearVR

Hi,

I’m working on a VR Gear project too and I see something wrong since 4.9 in the distorsion calculation which appears to be off in Unreal. I can see objects moving now when I just look on the right or the left (impression also to be on a moving ground). Also with a new project created from scratch.

Does this bad setting of NecktoEyeDistance could make this effect?

thanks