This may sound stupid, but on my winnings for today it shows i've played 1023 hands and won $xx, but on my daily graph it shows me playing 2071 hands and winning 3 times as much.
Do you have any filters applied? Click 'Clear'.
Did you play over midnight? The different reports as filtered/split up by date differently - if you play over midnight you need to set 'my day starts at' to a time you never play (e.g. 5am).