Well, there's always a reason, we just don't always understand it. I'd like to guess, though, that the router is not configured as a DHCP server for the wired ports, but it is for the wireless ports. This would mean that when the modem assigned an IP address to the desktop of some 192.168.0.XXX IP. Then when the desktop was connected back to the router, there was no more need for the router, (which wouldn't be assigning IP's to wired connections,) to assign an IP, because the computer had already been changed to a 192.168.0.XXX IP.
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