Well, it's fairly obvious that mold spores got in either the humidifier element or the humidor itself, and you have not adequately removed it. Ditch the piece of shit humidifier element, clean the fuckin humidor well (linky), get some damn beads, re-season the humidor, charge the beads and re-stock it. Don't keep the RH so high once ya get it fixed or you'll fuck it up again.