Huh I've never heard of that. The code is pretty simple, just runs the is_action_just_pressed() built in Godot function and does the score() function if it's true, which is identical for left and right so it shouldn't be possible for it to only happen with left. The fact that it happens with multiple inputs means it's probably not your keyboard either (unless they were all broken in ways that didn't affect the right keys , but that's unlikely). So yeah that's really weird, I'll look into it more.