is everyone DHCP or static? maybe someone has wandered onto your wifi network and is using one of your same IP addresses...
since it's your machine you should ping your duplicate IP address and check out the MAC address, if they are different from your NIC/PC then someone is hanging out on your wifi network....
change the subnet octet of your DHCP server and let everyone get new addys and everything should be fine and that person won't be leeching from you.
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