I logedin using my credentials user satalaj and I hit this url http://forums.asp.net/search/SearchResults.aspx?q=userid%3a878807&o=DateDescending

and I saw at top right corner, my signed in status was changed to budugu and point status to 17522.
 

I came to that url from below this thread http://forums.asp.net/t/1442536.aspx which I already alerted to moderator so it is no more now.

Could he be your log lost twin brother? :)) Just kidding.

 Naom :) There is no problem now but see I took a screen shot of such unexpected beheviour

http://2.bp.blogspot.com/_5ce_lDghTJQ/Sk25-OOqS1I/AAAAAAAAAIU/itSQArif3o4/s1600-h/somethingWrong.JPG

That's very strange. Did you log in on a shared computer? Couldn't say what happened... maybe you somehow hijacked another session. If that's the case, then there's something very wrong. When you were logged in as that account where you able to logout or access anything?

Pak,  No I was not able to change anything after that. But my Post points status and user name suddenly change.
I have no idea about this strange behaviour.
Right now it is resolved. my guess it was bug in application.

Thanks for documenting this so thoroughly.  Right now I am not sure what might have happened.  Please let me know if you see it again.