Forums Bug Reports Overflow error when saving X position of window??

I just threw a screenshot of my full desktop into Paint, and 2558,163 is exactly where it should be (since the screens aren't same size, I just left them about centered-ish as Windows suggest; since neither top- nor bottom-aliging them felt good when moving the mouse across). Still starts on the primary screen (which is connected via Display Port, btw; while the secondary is HDMI).
Not sure about the 2nd and 4th parameter in there. If its width/height, it should be closer to 1920x1040 rather than 1160x840. I'm not aware of any scaling on either of the screens; both should be 100% with no per-screen DPI.

Other Programs like Visual Studio correctly launch on the secondary screen when I close them there, so I'm not sure if this is some Windows thing or a mIRC issue.