I was just about to ask, I have the same thing with my Mac, every time I try to change the resolution it just kicks me back to 2880x1620, only when I put default in, it works. But I have a 5K monitor in which it will be a bit of a strain on the GPU
I had the same issue, but only whenever I change any settings at all. When you change the resolution back, you have to restart the game for things to go back.
Same issue for me, temporary fix was to disable Nvidia Overlay in Geforce Experience, otherwise the game was launching every time with resolution slightly off.