It will likely be because of the setting that displays how long a user remains as being active on the board. I can't remember what the default time is, but i have mine set to 30 mins. Did you create these accounts by registering or through the admincp?
If you registered the accounts, they will appear offline once their session has expired. You can edit how long the session is in the admincp. Go to admincp>vBulletin Options>Cookies and HTTP Header Options and change the session timeout to something smaller.
Anyway, i'm going to assume they're already showing as logged out since your post was 45 mins ago.
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