If only certain users are no showing their business title, this is more than likely because their business information is not marked as "Currently Employed". To correct this:
  1. Go to Core > People Finder
  2. Use the People Finder to search for the user and click their name
  3. In their profile, go to the Contact card
  4. Click the edit pencil for the Business information
  5. Mark off the check box for Currently Employed 
  6. Click Save