After ending of session, user's name remains on registered user's list and lamp is turned

Steps:
1. Sign in in forum
2. Go to some topic (topic of this user, or with his comment )
3. Remove session cookie http://screencast.com/t/S7DhIcFO and reload this page

Actual result:
User isn't log in, but is present on registered user's list (or in registered users that are browsing this topic) and lamp is turned http://screencast.com/t/7WF62qc9
Expected result:
User isn't present on registered user's list and lamp is turned off

Note!
If "Remember me" is checked, his cookie should be removed too http://screencast.com/t/xXVXy8tpw