On the epic report, the total original estimate only takes into account the stories/tasks that are linked to the epic but it does not take into account the estimates associated with the sub-tasks of those stories.

We use original time estimate as our estimation metric and it becomes very difficult to plan our sprints without this information.

We may have a story with 100 sub-tasks and all estimated however the original estimate will show up as 0 which i think is a bug.

Rahul