Drop Membership Level Doesn't Work

I set up 2 membership levels

1 - Visitors (I think this is a preset and everyone is a visitor) have restricted access to certain pages

2 - National Membership (paid) have all access to all pages.

I'm having a problem where when users sign up they get to have both levels, Visitor + National Membership but because of this the users that paid still have restricted access to certain pages.

I tried fixing it by going o Membership > All Members > and dropping the member from level but that doesn't work.

How can I fix this problem?