Strange behaviour in Adsense reports

I noticed a rather strange behavior recently in my Adsense reports. The impression count displayed on the overview page was different from the monthly report. The monthly figure was more than what is shown on the overview page for “this month”.

I thought this is because the monthly figure database was updated first and later overview database was populated. But sometime later I found that overview page showed bigger page impressions than the monthly report! When I checked about 5 minutes later both counts were same!

It is a small thing, but when you are checking your reports check monthly and all time reports as well. One of them might give you the latest view of your Adsense account!