Mac Pro keeps duplicating itself in Shared section of Finder
My computer has recently started duplicating itself in the Shared section of Finder. It's listing up to five separate versions of itself in there. When I open Photoshop it's saying it used to be installed in a different location and needs to be repaired. I presume this is because the computer name is being updated in Sharing.
This has happened since switching from an Airport Extreme router to an Asus one and then back again.
I have tried resetting the Airport Extreme to default and setting it up as new. It's connected via ethernet and wifi to the computer, but the problem is happening even with wifi switched off.
I also trashed com.apple.airport.airportutility.plist and restarted. It seems to still be happening. I've also been getting intermittent messages about my IP address being already used and it changes it. It was up to about 21 before I reset.
I've read elsewhere that this was a bug, but everything is up-to-date, so I don't know.
Mac Pro, OS X Yosemite (10.10.3)