Hi David!
Thanks for reaching out to us. Let me help you with that issue.
First, I can see you are using a previous version of The Events Calendar 4.5.11, so please make sure you update to the latest versions of our plugins. The latest version of The Events Calendar Pro 4.5.12.1 includes a fix for an issue that might relate to your problem.
If after updating you still experience that problem, then this could be related to a theme or plugin conflict. So to narrow down the problem, please go through the steps provided in our Testing for Conflicts guide here > https://theeventscalendar.com/knowledgebase/testing-for-conflicts/
Let us know how that goes and if you have other questions.
Thanks,
Victor