Why does BuddyPress Admin menu show me logged in for some and logged out for other sub-blogs?

When I am logged in as administrator on my main BuddyPress blog, then I go to my various sub-blogs, the following difference occurs:

Some sub-blogs have this top BP Menu:

Main.com, Login, Sign Up, Blog Authors

While other sub-blogs have this top BP Menu:

Main.com, My Account, My Blogs, Notification, Blog Authors

Question: What did I do differently with the sub-blogs that show me Logged In versus the sub-blogs that show me Logged Out?

Thanks,

Ed