Online Family Allowing Login During Curfew

I completely blocked my son from using the computer and set his time limit to 0 hours but he is still able to login.  I receive an alert that he logged in durng curfew but he should not be allowed to log in at all.  Also, when he wasn't blocked but had a time limit, he would get a warning that his time was up but he was able to continue using the computer, and not just for the extra 6 minutes they might be allowed.  He continues to be able to use the computer for much longer.  I have the option selected to lock him out and not just give a warning but allow him to continue.  And yes, the account is a standard user, password protected account.