Just noticed this oddity: this post and this post are by the same alias, in the same (campaign gameplay) thread, yet one has the alias's header displayed while the other displays the regular user's titles, and no header.
Could be a bug with editing a post, perhaps, but I've never seen it before.
Yep, it has to do with changing to an alias after posting. We keep the titles once a post is made for historical reference (for instance, if you scroll through my recent posts, you can note when my title changed).