iPad Mini 4 with the latest update... and ghost filtering on.   Two funky issues....  the first one didn't directly affect me, but was pretty odd:

This double image wasn't a ghost image, it was a real aircraft (I visually spotted it before it got behind me).  But there were two icons, pointed in different directions, with the same ID name, and it/they moved around with the aircraft.  Very odd.
The second one was an "atypical" ghost (and yes I had ghost filtering on).

At least it wasn't that weird box/diamond that I've seen a couple of times, but this one was different from my previous ghosts in that it was pointed away from me.  Usually when I have a ghost, it pointed in the exact same direction and is immediately behind me with just a little gap between me and it.  This one followed me (alerting like crazy) for about a minute.  Very odd.