One controller reading as two

I am using Dolphin 4.0.2 to play Super Smash Bros. Brawl but when I go to play four player, player 1 and 4 work normally but players 2 and 3 are both controlled by only one controller. I have four controllers set up on my laptop. an Xbox controller, a PS4 controller, and 2 PS2 controllers. The weird thing about this is that I have been playing this game with four players for a month and it worked fine. Dolphin reads all four controllers separately before the I turn the game on, and it still reads all four controllers separately when the game is on and I look under Option ---> Wiimote Settings. What is even more weird is that all four controllers work separately in the main menu of Super Smash Bros. Brawl but once I go to the screen where you choose characters, controller 2 controls players 2 and 3 and controller 3 does not work at all.

Does anyone know what is going on?