Does it matter where the external usb hub is plugged in?

I just got e new 7 port powered usb hub from Sitecom to connect a camera (once in a while) or card reader, printer(s), scanner, external drive etc. When I use one of the four ports on the backside of the iMac, only 1 -and only this one- specific port (let's name it "A" for now) of the Sitecom is recognised by the iMac. The other ports are not detected wether or not connected with an instrument.
But when I use the usb connection of the Apple-keyboard all of the 7 ports are detected.
What's wrong here?
Hans

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Does it matter where the external usb hub is plugged in?

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