The Double Shot Glitch doesn't work for me anymore. I open the game, load the save and I change the keybinds, but it doesn't work. Can anyone help me?

The double shot glitch stop working in the Shang Tsung Boss, is this normal?

On Shang Tsung the Double Shot glitch is not woking that's fine because is never working for him. Also it isn't working for Skeleton King, Hello Kitty, King DeDeDe, Ganon