FTDI board shows only one location id on dual channel 2232H
This is a shot in the dark, but I would set up both Windows PC's to do a long boot instead of a fast one. When booting up press the F2 key to open the bios editor, and under POST you should see and fast or slow boot option. Choose 'slow' and save and exit.

A slow boot forces bios to search for any and all new devices added or removed, then it can build a correct .dmi file (device master index) for the OS to use when it loads in.

I could not get my Windows 7 64 bit workstation (Dell 690) to 'see' that I now had 2 video cards and 4 monitors until I did several long boots in a row. Then I went back to a fast boot and all was ok. So a long boot has you waiting a minute or more but will catch any hardware changes made. If it works do several in a row so Windows puts the change in its own logs.