I bought a player and he became non-negotiable.

Last night I bought a player, Gervinho 111 upgraded on the orange stone,But I didn't like his gameplay and immediately tried to sell him, just like I did with Bobby Charlton and Mbappé, but when I tried to sell him it said the player wasn't available for transfer. I don't know if this is a game feature or a bug, but I want to say that this isn't fair. I didn't pay for an untradeable player; I paid for a player I could sell whenever I wanted.That's why he's in the store, because he's a tradable player. Please, I need an answer because I don't want to lose the FC Coins that took me a long time to collect, since I can only get non-tradable players.I want an answer to this,you are slowly losing your community