Why are some of my Jira tickets not showing on my confluence calendar?

[marcus_lyne]

I am a system administrator and have received a request to review a calendar being used in Confluence. The calendar has been set up using custom JQL's, but it is not showing all the issues it should be. When I copied and tested the JQL's in Jira, the missing issues from the calendar appeared, so there is nothing wrong with the JQL's being used. Not too sure where to turn to for the next steps so any help would be hugely appreciated. Thank you.