there seems to be a bug in your Flarm-NMEA parser (PFLAA sentence).
For the sake of testing, I did a little simulation in my Stratux.
Relevant NMEA output:
The PFLAA sentence shows a relativeNorth distance of 1111m and a relativeEast distance of 743m.
However, SkyDemon shows the distance as 0,0nm it its banner. The voice alert tells the correct distance.