4k Monitor-Unity editor reports wrong resolution[game window]

I just got a UHD monitor to try out which is 3840 x 2160. If I tell the game window to take a fixed size of 960x640, and then give it plenty of room to do so, it ends up taking 1440x960 instead. I verified this by taking a screenshot of my computer and measuring in a paint program.
If I click the stats window it also says its running at 960x640. This is pretty concerning since the main purpose of a high rez monitor is to get the game window smaller while testing high rez setups.

Anyone know the deal here?

EDIT i checked iPhone6 + and its the same problem. Its using 1.5x the pixels that it should be (2880x1620).

I know whats going on now. I had told windows to run icons and fonts at 150% for readability. This also effects the game window resolution. Turning that off “solved” the problem. However the text (in both unity and windows) is pretty small and I don’t think its usable as is.