I haven't found a fix for that part. My board works the same way.
The only workaround I have found is to custom edit your titles for your admins. If you edit your account through the Admin control panel for example, then you can choose to use a custom title for yourself and then include the appropriate stars. However, it won't change automatically by the number of posts.
It appears that certain accounts do not participate in the "title process" like a regular user would.
Anyone have any other suggestions?