We found a solution for this problem. The change is unfortunate but not permanent, the game does this automatically for some reason.
If you want a quick fix, get the group of players having the issue to play one club game. It changes the recommended server as same as your club's, which would be Europe in this situation. Then enjoy playing Drop-in-games with right region settings until you restart your XBox and have to go through that again.
EA said that it changes back to original after max couple of days,
