Do you have the same issue if you follow the OP’s steps to reproduce it?
I have the same issue since Aug 23 2021, Flight hours, Logbook, statistics and achievements ALL frozen “in time” .
Provide extra information to complete the original description of the issue:
Any flight I made after that were all in “incognito”
If relevant, provide additional screenshots/video:
Because of this I’ve bought an other copy from Steam.