@Smoo has that player transferred to Auxerre or has he come through their youth system?
If he has come through at the club then that's just a representation of the circumstances in which a player can end up having been in another nation. For example, the players family relocated.
However, its a really good example of something we would look into with this. He's a couple months off turning 18, he wants to leave and despite the fact he could have that move in a few months time (January) he's turned it down. Many thanks for providing that one, I'll get it passed on directly to our QA team who can check this out in more depth.
Examples don't have to be as strong as this one, but we definitely welcome further examples as save game files with specific negotiations in which we can review the logic behind the scenes is a massive benefit.