I recently acquired the Android mobile platform to more easily log flights upon completion and to use the Auto Night calculation feature. I am catching up on logging from this previous year and have been using the ICAO format for my international destinations. The first 10 or so entries seem to be auto logging night just fine based on Out and In times slaved to UTC. All flights I am logging are based in UTC time. The flight in question should roughly have around 0.5-0.7 night logged in the beginning of the flight. When I log the flight under ICAO code city pairs EDDK-LTFM there is no auto night showing up. When I log it under IATA codes, CGN-IST, it calculates 0.5 night hours correctly. My previous flights logged in ICAO format have calculated correctly. What could be the cause for the inconsistency of the Auto-Night function not calculating correctly when the only thing changed is the airport code format?