That's odd. I have open in both Halo and CoD, so I assume it's a glitch.
Test it in your 360 network settings (test connection), it will tell you if it's actually restricted or not. --- GT/PSN: Silt44 My Blog (Comics, Video Games, and Movies): www.arbitrarynerd.blogspot.com
It happens a lot for me with recent FPS games. Mine is always set at open yet in Halo 4 it claims it's closed, any CoD it claims it's moderate and BL2 it claimed it was strict. Yet I never have a problem joining anything or having anyone join my games so more than likely the games just don't read it right. --- Xbox Live GT: Nnnking