Google's stats are not allways accurate. People report huge differences between the numbers of today compared to yesterday. Clicks, impressions etc. are often out of sync. Wait a few hours or a full day to see the final stats. Google doesn't allways accurately refresh their stats.
A general rule at least for me is: the stats from two days ago don't change anymore. Anything newer is speculative - can change a lot. And only a 4 week report really can give you a clue about your adsense's success.