2013 CX-9 rear airflow mode problem

Hello. I'll keep it simple. I cannot control the airflow mode for the rear by using front controls even though it is synced.

I found this…

1. Turn on the front air conditioner on.

2. Press the rear switch. The rear air conditioner operates.

3. Selection of the airflow mode, airflow amount and temperature will be automatically controlled to the same temperature setting as the front air conditioner for the driver's side.

I'm confused because for #3 above I can get the airflow amount and temp to work but not the airflow mode.

Thanks in advance.