unregistered members showing up in membership area

I am usting the Buisiness Profile theme with buddy press and the membership plugin. The site requires a paid membership with recurring payments through 2CO.

I have found members on the site that had not registered are not listed in the users or the members lists, so I have no way of removiong them. I can see these members by clicking the buddy press members menu, but they do not show up anywhere else.

This is of great concern of me as it compromises the sensitive nature of my site. I have tested the sign in procedure and all seems well.

I just don't know where these rogue memberships are coming from or how they are accessing the site. And, I need to know how to delete them

The website is http://sisterhoodofsupport.com

Any help will be greatly appreciated.