recently my armatar at the top right seems to be dissapearing, when i try to change it back to cheetah, it changes to some other random armatar. BUT THE FUNNY THING is in my posts it remains as a cheetah.
Once again, another glitch. As long as it doesn't adversely affect you, it should be fine. I wouldn't touch your armatars until the problem is resolved.
It would definitely not be a problem with your computer. The Armatar system, along with other parts of AG, get glitchy from time to time. You should just try waiting for a little bit and see if the problem has resolved itself.
That's happened to me before, usually after I just log in after a long period of time. Like if I go on vacation and then come back and log in it seems like it does that.