I do not know if this problem is related to graphic settings. Outside the displayed areas, the night is perfectly fine. The area captured in screen 3 is really tiny, several meters. The area in images 1 and 2 is around the river approximately between the Mithras Serenity and the entrance to the arena.
Can also confirm that this is happening. I noticed it a few days ago, but it wasn’t important enough to me to comment on. But yeah, it’s a thing and it is weird. Seems like there’s a big ol’ fake lighting source in that area that shouldn’t be. If I had to guess.