> I just noticed in Device Manager that
> the wireless card is mislabeled as "Wireless PCI Adapter #2" even
> though there is just one card installed.

At some point, probably due to drivers, the card appeared different 'enough'
for the OS to treat it as such.

Since you don't mention what sort of network interface it's not possible to
pinpoint why. But a device moved to a different USB port, or card slot
would definitely do it. Combine that with screwing around with drivers and
it'll certainly happen.