My WSJT is set up to log a qso when receiving RR73 or 73. For me to receive 73 from the other user's program, it must have decoded my RRR, otherwise why it would automatically send me 73 twice. The argument from the DXer was that he didn't see my RR73 and so didn't log our qso. How can it be that he sends me 73 twice, which I decode but he doesn't record it? Isn't it a case of logging error on his (program) side? I used to miss a few qsos in the WSJT log before but now I installed JTAlertX which sends every qso to another log file, so I don't miss qsos.