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I have made a change to the site today which allows you to mouse over your average score and see the "full" average down to multiple decimal places. What is happening is after someone has a large number of games the average score is quite accurate and it takes a lot of games to actually move it. In your case with over 800 games played and a strong average you would need to have a lot of really amazing or really bad games to get it to move a full point... Hopefully this change will help.
Case
the average doesnt change or your stats dont update