When using any manufacture paint for this car the car becomes tinted various colors like orange, black or red. It seems to be whatever previous color you preview adds a tint to the base colors.
To reproduce
buy koenigsegg one:1.
If it does for you what it does for me then the base paint of the car has an odd orange tint.
Also noted
Previous colors preview also add a tint
If you are like me and have multiple saved designs for the car they also have incorrect tints (carbon fiber tinted red but should be like normal gray)
I have some pics if needed.