Dear Nikos,
I did experience as well, similarly on WSL2 with Ubuntu 20.04.
Yesterday I tried to reproduce it again, but I wasn’t able to. After a bit of searching, I found that there was a kernel update for WSL2 about a month ago, fixing an issue about the clock synchronisation between Windows and Ubuntu. (Release Notes for WSL kernel | Microsoft Docs)
Can you check if you have the 5.10.16.3 kernel, with the command uname -r?
The time difference you saw can be just a coincidence as the two commands weren’t run exactly at the same time.
Cheers,
David