I have 30 groups with about 80 roles in my system. When I go to http://localhost:8002/ui/group/16 I only see one role on my group when I should see 8 or so.

This seems to be happening because the UI is trying to fetch all roles in the system so that it can attach the permissions to display in the list: https://github.com/ansible/ansible-hub-ui/blob/feature/rbac-roles/src/containers/group-management/group-detail-role-management/group-detail-role-management.tsx#L97. If it can't cross reference the group's roles with the roles on the list, then it refuses to display the role.

Attempting to fetch all the roles when the page loads is a terrible idea. The UI should either fetch the role permissions when the role is expanded, or prefetch just the role data for the roles that are being displayed.