And as a test I restarted my computer again and its at the wrong screen again.
at the menu the number I need to use changed from 3 to 2 again (the normal screen number I need to use)

I did notice that the screens get recognized in a different order now.

0.013 [0]: \\.\DISPLAY1 - NVIDIA GeForce ...

Sorry for the very later reply it took a while before it happend again.
I don't disconnect my screen a lot and it does not trigger the problem.

So today it happend again after a pc restart and I noticed that the screen number that I need to use in the option menu changes from 2 to 3.
(the display I ...

I don't know when it happens but sometimes the game starts on the wrong screen.
I did notice that when this happens the game is not using the screen number that you set in the menu of the game.