Role Scoper and Capability Manager

Hello everyone,

I have this little issue: I installed those two plugins in the subject due to limit new users that are of elementary or middle school. So I created two new custom roles ElementarySchool and MiddleSchool and assigned categories to each of those two roles.
But when I have assigned to user for example MiddleSchool role, I see something like this in user’s profile:

Role possibilities
Wordpress Role assigned: MiddleSchool
(contains Guest, ElementarySchool, Subscriber)

so if I log in as that user I still see elementary’s school posts…how I can REMOVE those Guest and ElementarySchool roles from that user and keeping ONLY ElementarySchool role and Guest can see everything?….

thanks in advance to all!
Ciao, Luigi