How do I get all my sites to show in Membership 2 protection rules dropdown?

When I go to Membership 2, "Protection Rules" and try to select the site to set rules for, the dropdown doesn't show all my sites. I have ten sites and only 8 of them show on the dropdown. How do I get them to show up? I am not granting support access at this time because this is a live production application and I worry about anything disrupting it.