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How can one PC have two different names in the system log?

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I have one PC, a Dell Optiplex 980, that my wife uses. In my system log on my AC56U the Dell shows up twice with the same MAC address but with two different names. The router seems to be ignoring some attempt by the Dell to phone home to a local university. The Dell has a fresh install of Ubuntu Mate on it and Windows was wiped clean. I have poked around in the computers BIOS to see if there is anything in there and I did not see anything obvious.

Jun 4 20:13:07 dnsmasq-dhcp[252]: Ignoring domain facstaffpcs.spu.local for DHCP host name AD-SUB212
Jun 4 20:13:07 dnsmasq-dhcp[252]: DHCPACK(br0) 192.168.1.138 b8:ac:xx:xx:xx:xx AD-SUB212

Jun 4 18:13:20 dnsmasq-dhcp[252]: DHCPREQUEST(br0) 192.168.1.138 b8:ac:xx:xx:xx:xx
Jun 4 18:13:20 dnsmasq-dhcp[252]: DHCPACK(br0) 192.168.1.138 b8:ac:xx:xx:xx:xx OptiPlex-980

What could be causing this?
 

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