I don’t know if this is a bug or not. But it does look weird.
Changing shader from high to medium alters the colors quite noticeably. I do not know if this is intended or not, and which color set is the correct one.
Here it is on video: https://youtu.be/vucw52nbMb0
Card used is Nvidia GTX 660, driver 355.98 which is currently the newest one. OS = Win10pro 64bit