Although I didn’t get a screen shot yesterday then aircraft was popping all over the place including suddenly appearing 400NM east or 500NM west or 350NM North West of here. The plane would only appear there for a second or two.
Whilst it is possible I will get a legitimate position report over those distances every now and then it is really not possible for it to be two planes with the same ICAO and then seemingly returning to normal at about 5 NM. for a few minutes before exhibiting Warp speed again.
It is probably significant that it is changing ident between EVQ (VH-EVQ) and 23 8796 which seem to be the same aircraft (Aeroprakt as belzybob noted above.
That would account for the sudden location changes but not the change in Ident.
I can’t find 23-8796 even though the photo clearly shows that painted on the fuselage. Is that a registration number?
It makes a mess of my Skyview which is interesting but it is just my hobby and really of no consequence.
Does that data get fed into Flightaware (and Planefinder etc) and cause any anomalies further up the chain?