Denon sc6000 and Denon x1850

Hi. Ijust connected my players Denon sc6000 and mixer(x1850) tru a powered hubb to my mac. But the program only recognize player one. When i moving the pitch on both players only player one pitch is moving on the mac but everything looks ok in the computer preferences. When i am opening deck 1 in the menu it says deck 1 but when i open deck 2 it says 0 and i cant change it because its grey. Maybe i am stupid😅. Any ideas?(sorry for my bad spelling😅 i am only swedish)