|Jira Agile 6.3
Some issues are missing from the Active sprints but appears in the backlog as well as search result in the Issue Navigator.
This can happen when you have the following configuration:
Only Epics that are restricted by the board's filter will be shown. Therefore, issues that has Epic from other project will appear 'missing' in the Active sprints. However, these issues are still shown in the backlog and Issue Navigator due to the board's filter.