[Zeke]

Close the door to all but a slit of light coming in at the leading edge. Observe if the door edge meets the stop evenly. oldE is saying the frame is warped. Could be but doors warp more.

BTW, if the door hits top or bottom first and then has to be shoved in hard to latch, that is a problem. When faced with that, I remove stops and align them with how the door wants. Might not look pretty, but straightening out a twisted door takes all kinds of tricks with hardware and that's if you can stand the sight of the hardware. In the home itself, this door goes to the bin and a new flat door hung.