The correct answers are Project permissions, Application access, Group membership, and Project role membership.

Project permissions determine whether a user can browse or view issues in a given project. The JQL project = "ORION" will match all issues in that project but Jira will only display the issues each user has permission to see so differing project permissions produce different totals.

Application access controls which Jira products a user can use and it can affect visibility of issues tied to product specific features. If some users lack access to the application that hosts certain issues then they will get fewer results even when the filter is shared broadly.

Group membership is commonly used in permission schemes and in role assignments. If permissions are granted to particular groups then users who are not in those groups will not see the same set of issues as users who are in the groups.

Project role membership affects the permissions a user has inside a project. Users assigned to different roles may have different Browse Projects or other rights and that will change how many issues they can view when running the same filter.

Global permissions apply across the Jira instance and they do not normally restrict visibility of issues in a single project so they are unlikely to cause differing issue totals for a shared project filter.

Filter subscriptions only control who receives scheduled emails about a filter and they do not change what issues appear when a user runs the filter.

Issue type scheme configuration determines which issue types are available in a project and how they behave and it does not control per user visibility of issues so it would not explain the discrepancy.

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