It's also happened to me a couple of times when my opponents have timed out. Staff have fixed this for me as they now appear in my archive.
Disappearing games
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If you need help, please contact our Help and Support team.
Sometimes games are not being added to my archive, it has just happened again with a game where my opponent timed out. The game just does not get added to my archived games. I get the win in a tournament and it shows in the tournament table correctly but the game disappears.
Another odd thing is that the computer is telling me I have 5 active games when in fact I have 10, this is connected in some way to the disappearing games because there was only 4 difference but now it is 5.