Yep, there's your answer. It's just a visual glitch and should have the ? next to it.
I remember seeing something like that when I was going through and editing player's positions for 3-4 teams that had small DE and moving them to OLB. Some of their players still had ?'s and I had no access to adjust their ratings, but others were solid white and let me adjust their ratings. Good to know that there aren't any 90+ UDFAs coming in.