Hi Gian,
Firstly, did you start your flight by selecting "Flight - New - PP flight" within the Flight Logger to ensure it recorded the new flight and did not stick with data from a previous flight?
Second, did anything unusual happen in the flight?
Third, have you tried to resubmit the Pirep? You can save the flight details within Flogger and then send the Pirep in later if there is a problem at first, although if it hasn't recorded the flight details as a new flight this wouldn't help...