Dear DJI,
You make drones fly, but you can't make simple additions

that's something I saw too. It takes sometime (another flight) before the stats are being updated. However it recorded your latest flight.
I'm guessing the stats are being held at your DJI account and the flight data is recorded on your device instantly. I feel that it takes some while to update the stats on your account.
I fly with the SC and after synchronizing the data, I get the same stats on my smart phone running the DJI Go4 app. It takes some while before they both are on the same level. As my SC has no connection with my phone, the data must reside on my DJI account. That's probably where the difference comes from.