For different reasons items - esp. stories - in a backlog get done despite not scheduled into an iteration.
We can set the status on done but the story remains in backlog - which sounds illogical to us.
(Just think of a simple Kanban-style-board with columns from Backlog at left until done (or similar) at right.
when we set the status different than Backlog the story definitely is no linger in the Backlog - no matter if planned or not.)
Root cause might be the user not updating it properly, or some other reasons, but we cannot - in our circumstances - expect proper usage of V1 from every user in project as they have other problems to solve than usabliltiy of V1.
Please, adjust correspondingly. Thy, Michael