Incorrect screen resolution detected on launch

I am currently gaming on some old monitor with a max resolution of 1280x1024. But when PoE is launched, it is set to 1280x960. The part below the game screen shows portions of the windows taskbar.




The workaround is to open up the 15 seconds display mode change dialog window, from Windowed Fullscreen to Windowed and clicking revert, instead of confirming. It fixes itself to 1280x1024 (a bit of a paradox, considering what was before was 1280x960, but its underlying issue is fixed). However, this only works during the current game session. Next time I launch it, it goes back to 1280x960 again.