Burndown line running in reverse, bug?

[Kelly]

How is this burndown even possible? I've never seen the line run in reverse before. Is this a bug or is it more likely that someone did something really unusual with the sprint? I've glanced at the changelog and didn't see anything that looked weird.

Thanks!

[Brant Schroeder]

@Kelly Welcome to the Atlassian community

Do you have individuals who could be logging time in the future or who are working in a different timezone?  I have seen this on server and would assume it is the same issue on cloud.  An individual logs time in the future or is logging time in their timezone which is in the future compared to the server timezone.  The burndown chart shows what you are seeing because it does not render properly.  The fix was to delete the offending worklogs.