This is probably because the FCC data direct from the FCC is incomplete for this licensee and thus we're unable to build a joined query for the licensee. Not all FCC data is pristine to say the least.Something is still broke. I still see the same problem I reported a few weeks ago and the FCC data has been updated several times since then.
Certain licenses are not showing up. If you look up WQQU444 for example you get:
NO INFORMATION FOUND FOR CALLSIGN: WQQU444
But the licensee name appears in your web browsers window title or tab title. If there is no information found then how does it know who the licensee is?