Control Prochannel on busses

Hi!

When I select "sub" on the console and want to use the encoders to control the prochannel, let's say on the master bus, the datas on the lcd screen on the console do not update. It remain stocked on the last audio track I selected until I select the bus with the mouse. It do this on every busses. Is this intended or is there a setting that I missed?

Thanks!