OK, so you have add-ons that affect the postbit and by the looks of it a custom style (though difficult to say from the screenshot).
You'll need to do the usual troubleshooting things first to identify the issue. So:
- Disable all add-ons
- Switch to the default XenForo style
and see if the user titles appear.
If they do, then switch things on one at a time until you find out what's causing the issue.
I am assuming here that you still have the user titles in the ACP /admin.php?user-title-ladder/ and they haven't been deleted.