GearVR Line Trace Offset

Hi there,

I’m using line trace to get the object that the character is looking at. All goes on well on PC but once I install the project onto Samsung S6 and run it on GearVR, I notice that the tracing line is a bit lower than the actual eyesight and it hit the place a bit lower than the center of view (about 26 units). I’ve tried to set the trace start as actor eyes view point / camera location / camera manager location but all of them looks a bit lower than fact. Anyone knows how this happens?

The same issue in UE4.11p3.