How cold was it when you were flying?
This is sort of comparing Apples with Oranges but a few days back I was flying my Parrot Disco in a temperature of 1Degree Celsius, with windchill approximately minus 3Degree Celsius. I started with a fully charged battery but after five minutes it had dropped, according to the Parrot telemetry, to 67%. It sat at 67% for a further 10minutes and suddenly dropped to 55%. At this point I could no longer feel my fingers and thumbs and so landed. However when I checked the battery on a third party capacity checker it was showing only 12% left.
This is speculation only but is it possible that the 28% capacity shown in the OP’s screen grab is an erroneous reading and the Anafi actually went into low voltage shut down?
Regards
Nidge.