Registration issue on multi-buddypress-networks site

I'm using Networks for WordPress together with the BP Multi Network plugin. I have a network (businesses.org.nz) set up with a buddypress installation on its subdomain site (capital.businesses.org.nz). When I register from the subdomain bp site using Ultimate Facebook's connect feature, the account doesn't show up on the members list there (capital.businesses.org.nz/members), even though it is listed in the root network (businesses.org.nz/wp-admin/network/users.php) as belonging to that subdomain site (i.e. "capital" listed under the account's 'sites' column). How can it be made to show up on in the members list in the subdomain site, where the account was originally registered?