Why does my armor on Halo 3 keep changing?

[Jebus]

Okay, so whenever I change my armor, it changes to the original armor, then goes back to the way I changed it. Also, sometimes when I join a game on Xbox live, my armor will change and I will have different armor parts on. WTF is going on?

 

[Thomas M]

Change your armour then turn you xbox 360 off then turn it back on.