Status Quo: 

Currently only the very right column on the Agile Board does appear in the backlog. 

Problem:

Most teams are using a workflow similar to Open -> In Progress -> Ready for Review -> Closed with potential in-between steps for Code Reviews for example. As QA isn't part of the sprint team and therefore Ready for Review isn't part of the sprint goal, this means we often have tickets in Ready for Review that aren't closed at the end of the Sprint which then appear in the Backlog overview.

Solution:

Only show "unstarted" tickets, meaning grey status box, in the backlog overview.