Entire matches will be tagged to the wrong file. Round 1 can be messed up to Round 2 or 3 and the individual players within the round are also messed up. Seen this in my past correspondence games and in live sitewide tourneys as well.
Only reliable file tags are in my own profile page
And then there’s my review of a tournament game that is completely unreadable. https://online-go.com/review/158917