Hello @Thiwanka
Thank you for reaching out.
When you say "projected line" you mean the estimation statistic? Please, allow me to bring you some context on how the burndown chart works:
A Burndown Chart in Jira boards shows the actual and estimated amount of work to be done in a sprint. The horizontal x-axis in a Burndown Chart indicates time, and the vertical y-axis indicates cards (issues).
Basically, you can use it to track the total work remaining and to project the likelihood of achieving the sprint goal. By tracking the remaining work throughout the iteration, a team can manage its progress, and respond to trends accordingly. For example, if the Burndown Chart shows that the team may not likely reach the sprint goal, then the team can take the necessary actions to stay on track.
Checking the graphic you have added in the question, I believe you have estimated your issues after the Sprint beginning, causing the chart to display incoherent information. Please, take a look at the documentation below to better understand what each component of the graphic represents and how it exactly works:
View and understand the burndown chart
Let us know if you have any questions.
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