- last post: 01.01.0001 12:00 AM PDT
Some of the armors are bugged. You'll have to wait until a patch or update is released fixing these issues.
For future reference: Any Halo 3 related threads belong in the Halo 3 forum. Sure, it's crowded there but that's where you'll have to try your luck. Additionally, the answer to this question has been asked and answered several times. Use the search feature, too.
I hope this helps. :)