Not sure if you have ever had this happen before but.... Because the Scene commands are so easy to program (press and hold the scene button until it is saved); I have had customer's kids or friends of the family screw up the scene programming by doing just that.
So I no longer rely on the scene commands. I just send a few commands that will always do what I need it to.
On the higher end Yammy you have a lot more scene presets. Presets that are not easily accessible. So that's fine. But I stay away from using those first 4 scenes because of the above.