Membership 2 Navigation Element options


i have setup a membership using Standard Membership and have unticked the options for Allow users to register and this is a paid membership, but every time i go to the settings and make sure the settings for Registration and Account are deactivated from Please select pages you want to appear in your Navigation they turn off, but then go back on as soon as i go to another setting option

this means users are sometimes seeing their account details which we don't want to happen? any ideas as to why this keeps happening?