Lee, just checked my SBS database for yesterday's UAE419 and shows it was A6-ECE (B77W) with hexcode 89610C. So it wasn't me.
PlanePlotter displays the feeds from a few sharers in the Sydney basin from either their Kinetic SBS or RadarBox receivers. It would seem that one of the sharers' database has the wrong rego entered for that a/c and PP has picked up that incorrect rego and displayed it unfortunately.