Unable to sign up

I've been trying to set up a new account but this shows up. I have no idea who Chillistick is.

Problem...

Unfortunately, we have detected that the following username(s) have already been registered from your IP address. If you believe this is in error, or you are trying to legitimately change your account, please open a dispute and a sythe.org staff member will assist you. Make sure you include everything on this page in your dispute or it will not be addressed.
Username(s)

Chillistick

Time: 1372842968
Ip address: 183.90.103.159