Check your forum permissions, check your user group permissions and then check what access "guests" have to your forums. There is a fair bit to check there and it is possible that you may overlooked something.
If all your security settings are done properly there is no way a guest can see a restricted forum, other than logging in as a user.
Sometimes the Who's Online page shows that people are reading restricted pages - but if you look closely it shows that they get a warning or error message. This means that they've accessed the page but not the content and are presented with a message saying that they don't have sufficient access.
Other than that - what version do you have? Are you running the latest version? What hacks have you put in the system that could weaken the core security of VB?
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