Here's what the username line looks like on RPG main
And meta (sorry @Slate, I just happened to spot it on your profile):
From a brief investigation, this appears to affect all staff and consistently across other main/meta sites. For staff without diamonds there is no indication on their profile page that they're staff. In fact, they seem to include exactly the opposite.
This appears to be a regression of Employee profiles are now marked with a “Staff” indicator, presumably due to one (or both) of the recent changes around staff labels and user profiles, however neither of those list any indication these staff labels would be going away.
In addition, the announcement says:
The new mod badges will not yet be included on Main sites (or anywhere on Chat or the main StackExchange.com site) where for the time being, the good old unaddorned mod diamond will live on. And there are no plans to show staff labels on Main sites aside from the profile page.
The part on bold is no longer true, hence likely a bug.