I noticed that if you press run when the last viewed layout was Main Game, you don't go to the Game Initial Settings page, which sets the NumOfPlayers. So, NumOfPlayers starts at 0. Then when the Next Question button is pressed, your CurrentPlayer != NumOfPlayers event runs (1 != 0), but here you ADD CurrentPlayer + 1 to CurrentPlayer: 1+1+1=3.
Sorry, don't have time to look at your XML issue.