It's contrasting colors help it stand out on any surface. The colors were chosen so that the center dot is less visible when hovering on friendlies, and more visible when hovering on enemies.
Try using it at maximum size for a perfect fit with the PB indicator!
(Crosshair Size: 48, Shotgun Size...
I've been having this problem, too. Quitting to menu and rejoining, or even rebinding the reload key doesn't work. Did you ever end up figuring out what the problem was?