Root priviledges needed to poweroff

[ergodic]

Executing poweroff in F-17 (x86_64 up to date) defaults to the "Authentication is required for powering off the system while other users are logged in" snippet. 

Only one user (user1) actually logged in, however results from "who" and "users" show otherwise: 

# who 
user1 :0 2012-07-23 13:04 (:0) 
user1 pts/0 2012-07-23 14:39 (:0) 
root pts/1 2012-07-23 14:39 (:0) 
root pts/2 2012-07-23 14:39 (:0) 
root pts/3 2012-07-23 14:39 (:0) 
root pts/4 2012-07-23 14:39 (:0) 

# users 
ml ml root root root root 

Is this correct or is it there a problem? 

Thanks in advance. 
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