my laptop's NAV 2010 detecting unauthorized router/switch

5451iE1F5B820C849E27EMy laptop's NAV 2010 network security map displays an unauthorized router/switch that I don't recognize.

 

Using cable which gives us - television, phone service and internet, we are accessing the internet via a Linksys wireless-n home router with WPA2 security and a 13 digit alphanumeric passphrase. All the devices that were given passphrase authorization show up on the network security map and are identifiable. The network security map recorded that some "Alpha Networks Inc" router/switch had accessed the wireless network, though the Alpha Networks Inc router/switch was not online when I looked at the map.

 

I deleted the record of the occurrence, and again a few days later, the NAV 2010 security map displayed the same "Alpha Networks Inc" router/switch again.  There are about a half dozen wifi sources in the immediate area. My only guess is that perhaps one of these is triggering NAV network security, but given that we've changed our passphrase and made it strong, I don't know how the Alpha Networks Inc router/switch is still getting through, and all of our computers are running NAV 2010.

Any ideas?

Thanks.