Problem with bcf2000 mackie control and send fx

Hello all,

Been on Cubase element 9.0.2, i just started to re use my bcf2000 in mackie control mode ,
Just to figure out that:

When i switch on send fx mode (meaning all 8 upper rotary knobs used for fx send level of selected track)
It is no more controlling the send fx level , but instead , parameters of the channel strip (which appear before send fx on the mix console).

Is it a known issue or am i missing something since channel strip is here from cubase 7?

Thanks for reply as i am really stuck on my workflow for now!