My Microsoft Messenger Keeps Resetting My Msn Name Msn Username Keeps Resetting Itself On My Microsoft Messenger?

Msn username keeps resetting itself on my microsoft messenger? - my microsoft messenger keeps resetting my msn name

hey, I do not think that to say this really happened before, and I began to. basically, if you leave a mark again in my Microsoft Messenger on my Mac, I notice that my screen name back to the original amendment, as my screen name immediately deleted from Christina and my personal message was and then himself.
Someone knows why this happens and how can I change this?