DONTARI POE OFP TE NOT APPEARING???

I completed the Ghosts of MUTMas challenges and unpacked a Dontari Poe out of position tight end and when I went to look at him, he wasn't in my binder. My brother, an avid MUT player, said those cards can't be sold. I tried selling my Cam Newton MIKE LB card, and it said it couldn't be. Aren't they similar??? Tell me I'm not the only one who dealt with this "bug"