When we go into a course and view reports> statistics over 6 months back we get unusual results. (see attachment)

2 Instances of most month's appear, with one showing zero results.
e.g 1 November 2008 Students 915
1 November 2008 Students 0

Therefore meaning our statistics charts aren't showing a correct graphical representation.
Selecting a time frame up to 6 months works as expected. The dropdown menu allows us to select up to 5 years but after 6 months, doesn't show accurately