Is there a way to resolve a Burndown chart, if we create and start the sprint and then add Story Cards to it?
That will mess up your burndown permanently as far as I know.
My advice would be to move your stories in another sprint and start over.
Is there a way to delete the older Sprint in this case? I don't want to have 2 sprints with the same name...
Of course there is
https://confluence.atlassian.com/agile/jira-agile-user-s-guide/working-with-sprints/deleting-a-sprint
One more thing in relation to this issue. Next time add all relevant story cards to the Sprint first and only then actually start the sprint.
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