I have a number of issues that I put into a sprint. They were visible on the (Scrum) agile board in Plan mode and Work mode until they were resolved. After that, I expected to see them in the "Done" column in Work mode, as well as on the burndown report chart, but instead they disappeared from the board entirely. This is happening for all 'Resolved' issues within an active sprint.
When I open any of the issues, I see the (Active) sprint name as expected in the 'Aglile' area of the issue screen, but when I click on the link to 'View on Board' I get an error message: "There are no boards which contain this issue."
The engineers resolved the issues via the regular workflow, as opposed to dragging them into the 'Done' column on the agile board, but I don't think this should make a difference.