the drive redirection question of Windows 10

Hi all,

    we redirect the usb stick to win10. and it is ok. we can download a file to usb stick,

   but File explorer cannot show the icon of usb stick properly.

we redirect two sub sticks, but the file explorer only show one of them. (there are two sub stick icons at left side, but there is one usb stick icon at right side.)

        if we click Refresh, it will show two usb stick icons.

after we unplug the usb sticks, the File explorer has removed the icons of usb stick at left side, but there are strange icons at right side.

is there any idea about this phenomenon?

Thanks,

Derek