I realise this is an old thread, but commenting anyway. I tried the solution Toulinwoek mentioned of adding devices in ‘backward’ order but it didn’t seem to work for me.
I find working with Mackie protocol devices very frustrating in Cubase. Control surfaces are becoming ever more available and popular and it is well time the whole remote devices section in Cubase (which now looks visually very tired anyway) was given a proper up to date overhaul.