seems to be a quite old bug:
i have a few of these devices
see also
howto-gameport
tested with several betas from 28.1 to 31.2 under WinXP and Win7
when 2 devices connected GameController-(Devices-Analog) enumerates both devices but only one device is functional
When selecting 2nd device Renderer-(TTY) complains “Joystick not found”
No problems within Windows’s Device Manager indicated.