I understand your scenarioes and your well explanations.
To add more information I have added the test step in detail.
* Login into perlmonks. <user_1> ( ensure that I have not logged in anyother system and anyother domains ).
* logout from perlmonks. <user_1> logged out.
* login into perlmonks as <user_2>.
* please see the list of users logged in perlmonks.
It still shows that <user_1> also in the list.
Hope this would help to understand the scenario more.