CompletedIssueEstimateSum in GreenHopper is giving incorrect Value

[Yuvam Jain]

I am fetching Burndown chart of a sprint through REST API.  I am using Greenhopper API here.

Executing this api:
<My_Jira_InstanceURL>/rest/greenhopper/1.0/rapid/charts/sprintreport?rapidViewId=103&sprintId=9

Here, 103 is the Parent board and 9 is the Sprint ID.

The response contains various fields, but filed "CompletedIssueEstimateSum" is coming 8.3M. While story points assigned to the issues of this sprint is just 50.

It looks like, this count is coming as TimeEstimate instead of Story points.

Can someone please help me in identifiying:

1. Why there is such a big difference in the output?
2. How to deal with this condition/alternate solution .