Not sure if this is a bug, or an intended effect; but if it's intended, it kinda sucks and then this would be a suggestion to fix it.
Look for example to my name on the left; I got the VIOLET username glow.
The glow itself (if you look really carefully) is bright violet-colored, much like how the Legendary username color is. However, my username color itself has been dimmed significantly; it's an entirely different beigy-pinkish color instead of the bright violet pink it's intended to be.
[COLOR="Silver"]