The scenery night texture have a very slight blue color cast, which is intentional, but in your screenshot it looks way stronger than it's supposed to be. Maybe you changed the default HDR lighting parameters, possibly to increase saturation ? The defaults are:
Brightness 1.10
Bloom 1.0
Saturation 0.80
Or, do you use a 3rd party shader/tweaker, like PTA or similar ? Those would also change the way any scenery looks like.