quiz game problem

Hello everyone ,
So i'm working on this small class project , it's basically a quiz game , where 4 players get to push a button to answer the question , who ever pushes to button first takes the question .
So the only I met while working on it is that when a certain button is pressed , i let the referee choose between the wrong answer button or the right answer one , so that I add points to the player on go to the next question ,when i press a player button , it shows on the LCD screen for a millisecond the message " joueur 1" but then it neglects the referee buttons part , here's the code if you can help me !
This is a link that contains the circuit and the code :