if my p3s auto landed due to RTH malfunction. i didnt recover drone, and that flight log didnt show till THAT day. i think it's because the battery hadnt died, and delayed flight log data thoughts?

did you leave the rc and your viewing device on the whole time..........were you also very close to the downed bird while you left your rc and device  on

You can check the flight records on DJI GO. As for the flight data, it will kept in the aircraft and the previous might be overwritten.