XF 1.4 User Title Hierarchy

I asked in another thread about a hierarchy of user group rights. I have yet to tackle that issue but have a simpler one.

In our forum, I am a member of the group Instructors with a display styling priority of 900, and the group Senior Instructors with a display styling priority of 1000.

I would like only the higher display priority group membership to be shown underneath my name - now, both show. And, of course, if people are a member of Instructors but not Senior Instructors, I need that to appear beneath their names.

Both groups are set to Use Default Title Ladder, and both have a Use Banner Text filled in - when I deleted the banner text from Senior Instructors, it no longer appeared beneath my name.

Thanks in advance.