The backlog tab displays the workspace backlog, planned or those sprints being planned, and the active sprint.
This can be confusing to users because the backlog page leads one to believe that all isssues on the page are in fact, backlog.
However, the active sprint detail displays the "done" issues for that sprint, which are not technically, backlog. It clouds the view of what the backlog actually is when including "done" items.
In our case, it is confusing users, especially when introducing new users to the concept of backlog, and trying to explain "done" issues are not backlog, but the supporting filtering and page naming shows otherwise.
If you have experienced some of the same issues, please vote on the feature request supporting making a change in this area so it is more clear to users.
JSWCLOUD-26416 Rename or rework the Backlog to avoid confusion