Issues with nav tabs/pages that don't need to be there (and probably shouldn't be)...

I'm not sure if this is a Theme question or Membership plugin question... so please bear with me.

I've got the Membership plugin mostly setup on Social, but there's something weird going on here. I think. I'm not sure.

Some of pages "generated" by the Membership plugin are now showing up in the nav tabs when they should not be there. At least, I don't think so. I mean, Activate and Welcome should not be permanent tabs/pages. You can argue that Register "should" be, since visitors will want to sign up.

And forgive me, on a related but not necessarily germane question: why do I have a Protected Content tab/page showing up? I haven't even created any yet.

The site in question is: http://ufoextraterrestrialforum.com

Please advise.