M9 m5 x50 outdoor total 8 units 

i have several units in our house. There are many clients attached to the main deco m9 plus. 
 

And none to the other units in the house have attached clients. I wonder why are all attached to the main instead off the satellite units?

I have total of 8 units. All units show online in the app. 
 

I think an phone, tv etc should connect to the best signal nearby i o the main deco. It is set up as router and not access point. 
 

is there a setting no right?

what can be the reason?

thanks.