Hi,
We've just noticed that our Burndown Chart report is incorrect.
Some issues aren't in the row of type "Sprint Start" even though they have been created and evaluated before sprint was started (no '*' beside these issues, we've also checked the story history: created, evaluated and affected to the sprint one day before it has been launched).

When these issues change to "done" state, a new row in the table has been added with:
- 0 story point in the "Increase" column
- event detail: "Issue completed"

There isn't any row of "Issue added to sprint" type regarding theses issues.
Then if we move theses issues to "In progress" state, a new row in the table has been added with:
- 'n' story points in the "Increase" column
- event detail: "Issue reopen"
When these issues change to "done" state, a new row in the table has been added with:
- 'n' story point in the "Decrease" column
- event detail: "Issue completed"

We have compared issues with and without this problem but we can't find any common factor.
Any help would be greatly appreciated.