As you can see in the two screenshots below the accumulative statistics graph is not correct. If you look very closely at the dates, you can see that for the date range of 'last 14 days' (left) ranges from 11/22 to 12/16 (25 days) and for 'last 7 days' (right) the range is from 09/12 to 12/20 (12 days). You can see that the wrong data is to the left of the correct start dates (12/03 for the left graph and 14/20 for the right graph). It seems the date range just needs to be fixed.