Presumably interfere USB 3.0 high transfer rate the wireless connection between the mouse and Logitech adapter, so that the mouse movement is not transmitted clean. If the Unifying adapter plugged in stroke alone it's still just so, but as soon as eg an external USB hard drive or a smartphone (via USB cable) happen, the mouse does not work properly.
I then switched to a USB 2.0 hub - and the interference is gone.
ANCHOR writes in the accompanying instructions:
"Wireless 2.4GHz devices, MIDI devices and some USB 3.0 devices may not be supported. Try to use the host port or a USB 2.0 connection."