Mystery Computer on Network

I have two computers and an iPhone on my network.
My MacBook and iPhone access the network wirelessly and my G5 is connected directly to the Time Machine.
MAC Address Access Control is enabled on the network.
Yet, on the MacBook, listed among the Shared items in the Sidebar is what appears to be a PC Server called mac000a95b05265c. The phantom PC does not appear among the shared items on the G5.
Does anyone have any ideas what could account for this?
Matt

UPDATE:
The phantom disappeared after updating the Time Machine's firmware to 7.4.1.
Matt

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