Bronze extinct player.... DISAPPEARING

Please EA tell me what's going on with ultimate team.... I opened a few bronze packs, I come across a player worth 10k (extinct), I market them for 10k, the player doesn't sell but then the player disappeared from my transfer list (no coins, no player) this has happend a few times now. Also when i try and get the stats for the player while they are listed I get met with this message (Error retrieving player stats. Please try again later). Now I have noticed that when I get that message on a player that player tends to dissappear from the transfer list.