One of our teams has created a Release Calendar page which they use for overviews related to Releases (Versions), Sprints and Jira Issues from their Project in Jira.
Now most users can see the content correctly displayed in the Confluence Page, however a few people only see a blank calendar. They are using Chrome as a browser. The users that can't see the content is a users of the Space with the right permissions. Additionally these users also having the right roles in the Jira Project and no restrictions to permissions are applied.
Screenshot of the view from users who can see the content

Screenshot of the view from users who can't see the content

Any idea what can cause this?
Regards,
Robin