JIRA Portfolio mismatch: Timeline vs Estimated Effort

[Rowland Reed]

I'm performing an eval of JIRA Portfolio, and in one experiment I'm seeing unexpected results.

I have an Epic which contains a Story which contains one subtask with an Estimated Effort of 15d.

The Scope window clearly shows the 15d estimate, but the schedule bar shows only 3 days to complete the task.  See the attached image.

What is causing this discrepancy?

thanks,

-rowland