2nd X-Touch Extender cannot be connected

I have one main unit of Behringer X-Touch and 2 Extenders. Connecting the main unit and Extender nr.1 works fawlessly. But once I try to connect the 2nd., also via USB,it appears that Ext2 is a “copy” of Ext1,and they are not like numbered differently inside Windows/Device Manager. Both of them are named just X-Touch Ext…What is this??? I tried doing some workaround,like connecting them all via rtpMidi,without any positive results. And in some Forums, they say that this is Cubase issue,because they say that Cubase is limited only to max 2 controllers,like from 1-8 and 9-16,whic I have hard to believe,because I had a Tascam DM-48,and there I got 24 fadera to control. Does anyone here have some descent answer to this matter?

Hi,

Cubase can handle 3 Mackie Controls, as the standard allows (I saw it in some studios already).

How does it look like in the Studio > Studio Setup > MIDI Ports Setup, please?

You may see picture of the Midi Setup in one of the pictures enclosed.