Empty burndown chart - No data in chart even though time spent logged

[get ab]

I am unable to populate any data in Burndown chart, even though all the data (Tasks, TIme Spent. Remaining TIme) is present. All I see is a red horizontal line (progress). The table below the chart is completely empty. But these issues have time spent , estimated estimate fields logged in by the team in Jira.

Same is the case with Sprint Report. Chart shows Redline.

I tired re-index etc. Have checked time-tracking and permissions settings as well. Estimation Statistic is SP while tracking is on Time Spent/Remaining Estimate I am not able to figure out where the issue is?

If anyone has face this before, how did you fix it. 

[Nic Brough [Adaptavist]]

Change the estimation statistic to time tracking.  The burn downs all work off the estimation statistic and you appear to be using time, not story points.

[get ab]

I tried that. But even then I see the same horizontal line. And tasks have 0 Remaining Time and Time Spent in the table below the burndown chart. Even though team has entered it. 

[Nic Brough [Adaptavist]]

Ok, what estimates did you enter when you were planning/grooming the issues that went into the sprint?

[get ab]

Stories are in SP. But tasks are in hours. I need to track hours burnt on a day to day basis. 

[Nic Brough [Adaptavist]]

You can only burn down on on statistic in a board.  The only way this is going to work is if you have separate boards for Stories and Tasks.