Bug mouse position is only 25% of the screen

Hi there I'm getting a report (and video) from a tester that has its mouse inputs locked to about 25% of his screen, so basically only the bottom left quadrant is seen as the entire screen.

it feels like some sort of resolution issue tbh, but it's kinda weird. And I cannot reproduce this myself to debug.

Basically instead of (0,0,1,1) it seems to be (0,0,0.25f,0.25f) as the rectangle of the screen.
Anybody know of something that might cause this , works fine for most users it seems, except this one person.



I'm using this code:

Code (CSharp):

1.    rawmouse = hasMouse ? Mouse.current.position.ReadValue() : Vector2.zero;
2.  
3.      float distance;
4.                     Ray ray = MasterManager.listManager.FreeCam.ScreenPointToRay(MasterManager.listManager.InputManager.rawmouse);
5.                     plane.SetNormalAndPosition(Vector3.up, BuildselectorBase.transform.position);
6.                     if (plane.Raycast(ray, out distance))
7.                     {
8.                         Cursor.position = ray.GetPoint(distance);// MasterManager.MasterControls.BuildReticuleCenterY.TransformDirection(new Vector3(MasterManager.listManager.InputManager.MousePosRelativeToCenter.x, 0, MasterManager.listManager.InputManager.MousePosRelativeToCenter.y) * -1f * (camdistanceLimiter - 1f));
9.  
10.                         //   cursor3d.position =
11.                     }

 

here is the video it gets clearer at 30 seconds, where you see he can only move the cursor (if you can call it that) inside the bottom left quadrant..

kinda weird