Can you clarify one thing for me please? So you push the shifter to the left, and that's makes it D/S. Do you then press the paddles to make it fully manual before you start to drive? Because from what I understand and experience on my car, if I don't touch the paddles while the car is in D/S, it will still shift by itself but at a higher rpm. Sometimes I leave the car in D/S and start driving. If I then try to upshift myself at a high rpm while the transmission is also going to shift, I get a double shift. As the poster above me said the computer takes priority. This is what I think you're experiencing. Try making the car fully manual before you start driving and see if it happens again.
Sorry if this post is not coherent. Running on 3 hours of sleep and no coffee
