Oneplus3 update to Nougat, Oxygen

OK, so it’s not really the Nougat android update I guess. I fugure it’s the Oxygen update from OnePlus. Anyway, I got the Nougat update about 6 months ago and can’t figure this out. When the screen does the wake to show the time, sometimes the hour is red instead of white. I can’t seem to find out why. Any help?