Non-managers able to post to "Manager Only" designated forums

Today I noticed that a new member on my Music PAL Forum posted a message on my Help Files & Tips forum which is reserved only for manager use. It's alwasy been set and still is set for "only managers can post" (approx. wording), but that option is definately selected! Yet it's possible for non-manager members to somehow post to that Discussion forum.

Please check into this new (unexpected) bug or glitch. I had to remove the member's post and send him an email to explain that he needs to post this on the General Messages forum, so he'll have to start over which is not the best way to "welcome" a new member.

Thanks!
Michael Borges - Music PAL Forum