Hi manishbly ,
I was trying to find a way to link to another topic, but it seems I'm going to have to go with a simple web link.
I answered this question a few weeks ago in this community, have a look (in short: the report is faulty ;)).
https://community.smartbear.com/t5/Zephyr-Scale-formerly-TM4J/Burn-Down-Chart-Dashboard-gadget-does-not-display-accurate-burn/m-p/220272
Cheers
Josh