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They do this sometimes if they determine some clicks are invalid. Better a little loss of revenue than a Ban... Don't you think so.
Also if you are frequently checking your stats, you may see the stats regress a bit, but they normally come back after a while. So you may have posted a little bit too early. Wait for a while and then check.
A year or two ago, for example, numbers for the current day used to vary quite a bit depending on the view you looked at ("today" or "this month"). It also used to be common for numbers to lag by a few hours, with the server playing catch-up during the evening.
[edited by: jatar_k at 6:31 am (utc) on Oct. 17, 2006]
You can log in sometimes and see the previous statistics presented, but new stats on different reports.
You shouldn't regard the figures that appear during the day as anything more than a rough indication of how things are going. The figures can't be considered accurate until after the end of day. In fact, they can't be considered accurate until the point the EFT payment has been made and you have the cash in your greasy paws:)
Occasionally during the day, I find that any earlier set of stats are displayed - this always gets sorted - often opening a new browser window for the Adsense report can be enough.