When grabbing the bottom right corner of any window (finder, safari, mail, terminal) to resize the window, the rest of the window jumps to a specific point on the screen.
Likewise, autocomplete text fields (such as Finder Find or Mail's search), when I Start typing, the text suggestion / popup shows up somewhere else on the screen.
I've tried changing the screen resolution from default to scaled higher and lower, and while it temporarily seemed to fix it, the problem keeps coming back despite the resolution being the same.
I have no idea what to do.
I've already reformatted from the emergency / recovery drive once to try to squash this. This is a brand new MBP 15" running El Cap 10.11.13. I have no outstanding updates to perform. I am not projected to a display or running airplay screen display.