ok... I re-write everything again...
Any device with USB-C connection (no matter if they are USB3/3.1/3.2) connected the USB-C (
HS09/SS09 for our Asus Z690 Pro Art) front port of my
Fractal Define USB-C r6 case has got that strange behaviour you can watch in the zipped video attached. I tried at least 3 Usb-C to USB-C cables and the error is always present.
On the other hand same devices and same cables present
no errors if I connect them to the back USB-C ports (actually TH4 ports) of the motherboard.
I tried also to connect them by the way of an
adapter but the error is still present, so it's not the internal cable of my case. I've also tried the same devices with an USB-C to USB-A 3.0 cable (i.e. using SS07/HS07 or SS08/HS08 ports) and they do work normally.
So the only port affected is HS09/SS09.... any hints? TIA
UPDATE 1: loaded an image where you can see the "double" loading of the device, as shown in the video.