Good evening Tim and welcome to the Events Calendar forum!
Thank you for your interest in our products. It’s truly appreciated.
However, please note we do not offer support for our free plugin in this forum.
Normally I would suggest to please repost your question over here: https://wordpress.org/support/plugin/the-events-calendar .
However, in your specific case, this is not a bug, but rather some kind of conflict caused either by your theme, one of your plugins or your version of WordPress. Although I can replicate this issue on your website, the youtube video works great on a default clean WordPress install with a built-in WordPress theme.
The best I can do is to suggest that you go through our testing for conflicts procedure (preferably in a staging/dev environment or local install of your WordPress website).
Basically the goal here is to revert back to a bare WordPress installation to see if the problem persists.
For now I will then close this thread. Thank you for your understanding.
Best regards,
Geoff B.