I've had a look at the file you shared with us with exiftool. There's something odd with the dates in the file.
The EXIF date and time are correct and all show 21:20:18 as time of creation. BUT all QuickTime times are all set as 20:20:18 (and I think this is what PM6 is using when it displays the time of a video).
These QuickTime times are supposed to be in UTC (though many camera manufacturers don't adhere to this standard), which in this case should have gotten you 19:20:18, not 20:20:18 (your time zone is 2 hours ahead of UTC).
I'm not sure what caused this discrepancy, it could be a bug in the camera or have you perhaps adjusted the times in the file (in which case the times in the QuickTime block weren't adjusted similarly)?