Looking at the account, the email is [email protected] where XX is a number i wont reveal, and the "real name" is my name. I have no idea what that email is - perhaps the account has been hacked, but if so, could they have changed my username to sarath, but kept my session on my Machine?

Its not a shared computer. The ISP is telefonica in Spain. In 10 years with them, I have never seen this issue on another site.

Well, Sarath starts with Sara, so I guessed a girl, and I feel like a girl writing this, but you are right, it could be anyone.

I am not on a shared computer, None except me has ever logged into serverfault or related site.