UR22C "Mix" adjustment does not work when connected to Cubase

Hi,
I have a question, I have a UR22C for a month and have noticed that the Mix adjustment between direct and DAW does not work when Cubase is active on my PC. When I close Cubase it works then with any sound played from PC. Does anybody experience the same. Is there any way to change it so I can use the Mix when I record the vocal