Now, I'm very certain that these are not just crazy-named real wifi connections, they  really don't exist. Ubuntu don't  see these after wireless restarted and already double checked with my other wifi devices.
But they always appear after I connect to my local "Shared With Other Computer" wifi connection. They don't do any harm as far as I can tell, connection wise. A ghostly bug :)

the only real wireless network is the one called Koalayangbaik (=the good koala)