Please find attached two screenshots of the same website. One is for the date range 2015-03-01 – 2015-04-29, and the other is 2015-03-01 – 2015-04-30.
You would expect the number of page views in the latter to be at least as high as the former, as the former’s date range is entirely within the latter’s.
While the graphs look correct (they are both very similar), the actual number of visits, pageviews and unique pageviews are wrong. There are 10,956 pageviews in the greater range, but 26,694 in the narrower range.
Why the inconsistency?