No idea, as I don't read minds nor can I see through a computer to tell which browser you are using, what you are seeing or any sort of details that might point to a solution.
Just saying the "colors" are off, is too vague to do anything about.
Gents,
I'm the furthest thing from a computer guru, but mine did that and I got it to change back bu changing "my prefered stylesheet" to ubbthreads. It only takes a second, so might be worth a try.
Mine does that as well. With my limited knowledge, I was happy to get back to black on white printing. Didn't really care much which shade of baby poop the border resembled.
It had been so long since I set mine up i couldn't remember how I got everything from the dark green /grey to light green and white. It use to be a choice in preferences but cant find it now