Mackie Pro FX v3 12 channel

Hello all im no expert by far so please forgive my ignorance in advance.

I Just bought the mackie mixer mentioned in the title, i am coming from a behringer x1622 for the last 10 years given the sound would cut in and out i decided to finally replace it. Given my amateur understanding i was able to make all the correct connections and get mostly everything working, the problem is the Sub 1-2 channel on my behringer i was able to make it so everything on the sub channel was only what i heard and not sent into the main mix for everyone else, on the mackie with the correct channels on the inputs pushed in 1-2 i dont hear anything unless i have (to phones control rm) pushed in same for the behringer the only difference is when i do that the main sub fader becomes disabled and does not do anything. Is this by design or am i doing something wrong ? please help
 
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