Good evening Simon and welcome back!
Thank you for reaching out to us.
We are sorry to hear that some of your exclusions are not working as expected.
I would love to help you with this topic.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Secondly, could you provide me with a screenshot of the settings for that specific event ?
Finally, could you tell me what your timezone settings are for the Events Calendar and for WordPress ?
Best regards,
Geoff B.