I have two i-pac2s. One board controls players 1 and 3 and the other controls players 2 and 4 as well as the trackball. I have the inputs of the 4 players mapped to a keyboard and none of the buttons overlap but I cannot use any of the buttons in a game except for player 1’s. All player inputs are mapped correctly in the ‘All’ retroarch.cfg. What configuration am I missing to make the other players work properly?