Thank you for your tests.
I don't understand why VLC is not correct
I uninstalled VLC with "remove preferences and cache" then reinstalled (last version 3.0.16).
No changes, stretched result. 😭
I tested old 10.96 version and it's the same result: VLC play is stretched and I don't know why.
But I see something strange (in all versions).
My video are vertical so they are 1080x1920 but:
Lossless details are swapped: https://drive.google.com/file/d/1IXrnnh9sAWBwgdJu1q3B8T4lVW4BRw55/view?usp=sharing
Reencoded are correct: https://drive.google.com/file/d/1yA70UHaWW7b1TGbe9eowgwUx85Mu7nCJ/view?usp=sharing
TY!
Matteo