How are Guests (spambots) viewing my threads when disabled?
 

On my forum, I have temporarily disabled new registrations. Under the Unregistered/Guest settings, I have set Guests to NO on Viewing the Forum, Viewing Threads, pretty much everything. We were plagued by 100+ attempted registrations a day. I'm doing this temporarily to see if they forget about us. Anyways, even with my settings like they are, when I look at the user lists, there are always 15-20 guests viewing different threads. If I log out, I can't get past the login screen without a legitimate login, how are they getting in? What setting can I change?