ALL issues from past & closed sprints have lost the sprint connection

Question

I have a very odd problem.

All of a sudden (typical:-/) all issues which where assigned with older sprints lost their assigned sprints! Therefore the Backlog is showing Issues which have been done a year ago and so on. Not to mention that the backlog now became huge (~1000 issues are shown)

My current research showes the following:
- The logs / history from those issues don't show anything besides the normal changes which happened to them while beeing worked on.
- ONLY the issues of the past sprints are affected
- The issues have NOT lost their done state
- The sprint reports are still showing the proper data (due to those reports I can also access the issues).

Does anyone can tell 
- what happened??
- and of course more important: how to fix this?

Best
Michael

(As of now I have a quick filter installed to filter out all issues marked as done so that the team is able to work.)

Michael Mitschke · Answer

it needs to - I am just on my way to open up an official bug.

Nic Brough -Adaptavist- · Answer

Hmm.  If there's no history of sprint changes in the issue history, then that implies they were never in a sprint in the first place.

Even if you delete old sprints, that doesn't change the entries in the history, let alone delete them.

The only way to delete from the history of issues is to write scripts or hack the database (both of them only possible on server)

If this is truly a Cloud install as you've flagged, then this needs to go to Atlassian to look into.

Michael Mitschke · Answer

Hey Nic,

As I wrote: unfortunately the logs/histories dont show any such activities.

It starts to look like some kind if database problem ??
Is there a way to report a bug to atlassian?