An Introduction to User Titles 
User titles are the descriptions of a user that are displayed under his or her username in a post. These titles will often refer to one of three things:
  • The user’s amount of activity on the board (Junior Member, Senior Member). This is usually set through the default user title ladder that will be described in this section.
  • The user’s relationship to the board (Administrator, Moderator). This is usually set through a usergroup-specific user title that overrides the default user title ladder.
  • A custom title, specified by the user; this can refer to anything the user desires. The user may not have permission to set their own user title; it is controlled by a usergroup permission.

Brad 20th Apr 2005, 11:03am
When working with secondary usergroups in which members recive custom titles [b]based on their second usergroup[/b]. You must keep in mind that the secondary usertitle can overwrite the first usertitle.

However this will not happen until the user enters their usercp and becomes a member of the second usergroup.

As of 3.0.1 this is the default behavor, I do not know if this is considered a bug or not, but that was not the nature of this post :)