This issue arises because, if the site allows any public sharing, the "create filter" UI gives team members the option to share a new filter with "Everyone", which sounds like an org-local scope but is in fact a public/non-logged-in scope. The org-level scope is called, "Open", and is not part of this UI. Sigh.
To prevent this issue as a site admin on Jira cloud, go to:
Jira Settings -> System -> General Configuration
and disable "Allow users to share dashboards and filters with the public." This doesn't affect existing filters, which you have to manually fix.
In true Jira fashion, if you try to reassign a filter after flipping this setting, it will deny the operation and ask you to edit the ACL, which there is no convenient admin UI to do.
Jira is a disaster of UX.
To prevent this issue as a site admin on Jira cloud, go to:
and disable "Allow users to share dashboards and filters with the public." This doesn't affect existing filters, which you have to manually fix.In true Jira fashion, if you try to reassign a filter after flipping this setting, it will deny the operation and ask you to edit the ACL, which there is no convenient admin UI to do.
Jira is a disaster of UX.