I would need more hints on the conditions that you see this occur and her to be able to help you to be honest. Typically when things disappear it’s because either someone has moved them or because there is a quick filter that has been applied and should be cleared or the board filter may have changed itself. Finally it could be that someone with the delete issue permissions has deleted the issue which would be unfortunate.
Thank you for responding to my question. Only myself (admin) and a developer are active users. We didn't apply any filter or delete the issue. Anyway, I have enable a feature to email the issue so that I can find it in inbox if I cannot find in the Backlog.
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events