When the a page is favourited by the user, a label favourite will be created and associated with the page in the database identify with namespace my and the owner userkey in the label table. Please note, this label is not visible in the actual page.

When a actual favourite label is created in the page, the label does not have a owner and it is identified as global in the namespace.

However, when you search by label in the Confluence either using Confluence search or contentbylabel macro, both the user favourite page and the pages with the actual 'favourite label' will be listed in the result.

This can prove to be confusing and misleading.

A possible solution to this issue is to search Confluence label under the namespace 'global' only.