Why Work Items disappeared from backlog?

Hi @Alla Tadevosyan 

Check the configuration of the board.

Is the backlog option still enabled and the status mapped to the backlog, for company managed space, or is the status mapped to the backlog on Team managed space?

Resolved! 

The issue was in the Workflow configuration, the Backlog status had its category set to "Done" instead of "To Do". 

Not sure how or when this changed, but switching the category back to "To Do" fixed everything.

Thanks everyone for the suggestions — especially pointing me toward the workflow and board configuration. Really appreciate the help! 

Hi @Alla Tadevosyan,

Welcome to Atlassian Community!

Boards are controlled by a filter, so that is what I would look at first. Does the filter return those items that are in the backlog status? 

@Alla Tadevosyan jan,

Since you confirmed that the filter and backlog mapping are correct, this doesn't sound like a configuration issue. I'd try refreshing the board configuration by temporarily removing and re-adding the backlog status, and, if the problem persists, I'd recommend opening a support ticket with Atlassian, as this may be a product issue rather than a configuration problem.

Hi @Alla Tadevosyan

Welcome to the Atlassian Community!

Both @Marc -Devoteam-  and @Mikael Sandberg suggestions are good starting points.
I'd first verify the board filter and the backlog/status mapping, as those are the most common reasons for issues disappearing from the Backlog while remaining visible elsewhere. Also check the board filter; does it return that issue?

I'd also check whether the affected issues have accidentally been assigned to an active sprint. Work items that belong to an active sprint won't appear in the Backlog, even though they are still returned by the board filter and visible in the List view.