I think I know what might be happening. is the button prompt (under "Hold") displaying RMB during play? is it changing on its own at all?
I'll have to start up the game and check I'll edit this post once I find out. To clarifiy is this text visible when I'm playing the game? And while playing I'll hear the sound of treats merging together but I'm not playing that game mode for instance I'm at the time of typing this playing Khloe match 8 game yet heard the sound.