Ghost ADSB return + ADSB boot

New Flightbox using FlyQ EFB on an iPad mini 4 … First real test of the unit in my Glastar.

To boot the ADSB I had to spark it to start by selecting, then deselecting the Levil AHRS/Dynon D2 AHRS. Once up, it ran fine.

I was “followed” by a phantom return throughout my flights … 4 flights totaling 3.8 hours … The unit is mounted on velcro on the floor of my baggage compartment (composite fuselage with a steel tube cage).

Any ideas?