Vern, hi, and thank you for reporting this issue.
Please do the following for me, so that I can help you out.
1. Start iFly.
2. Menu => About => Connected Devices => Wireless Device => Enable Logger (check the box).
3. Fly your flight, with ADSB Device receiving data from the towers.
4. Upon landing, restart iFly, and then do: Menu => About => Send Bug Report => Select Log => select "AdsbRaw.bin"
From this AdsbRaw.bin file, I can reproduce your entire data stream and tell you what is happening.
I assume you are testing this in the air. Often Adsb devices don't get reception until airborn since the towers are focusing their signal upwards... I am not positve of this, it's just what I've heard from others.