Why is the cumulative flow diagram not a rectangle?

Discussion created by f078446e7a8acc859737c31ddc3edf4c on Sep 2, 2014
Latest reply on Sep 2, 2014 by John_Streeter
Expected result in cumulative flow diagram, for the usual case where no stories are added, nor change size (points) during the sprint, that:

1. The diagram is a rectangle
2. The right-hand end of the rectangle ends at the current date
3. All dates after the current date are blank
4. The date range for the diagram (when filtered on a single sprint) is sprint start date to sprint end date

I inserted a screen shot where I marked the unexpected part -- where it falls off to zero -- with my own red rectangle.