Well you have to play with exact colortags as you have in Nickname Reservations on trackbase.
So check if its exact on http://et.trackbase.net/reserve/
If they are, maybe a glitch...
Try removing color tags on trackbase http://et.trackbase.net/reserve/
Leave the field: "Colortags (ignored if empty)" empty, and save.
Then imput them again, "make sure they are correct" and save.
Test it if it works.