Quoted from epthegeek:
Probably just an incomplete capture/color job by whoever worked on that title. Coloring the service menu is a deep rabbit hole I don't even bother with on the titles I do usually.
I completely agree, I have only fully colored one game but I did the sprite modes on another. I thought, oh I can just bang out the service menu, I wasted so much time on and it. In the end just through in the towel and left it the default color. You get so close and then the whole thing just falls apart and makes it much worse. There is just two many variables.