Good evening Keith and welcome to the Events Calendar forum!
Thank you for your interest in our products. It’s truly appreciated.
However, please note that we do not offer support for our free plugin in this premium add-ons forum.
But, the good news is that you are still welcome to consult this forum to your liking and browse it for solutions, snippets and tutorials.
If you don’t mind, in the future could you please post your support questions here: https://wordpress.org/support/plugin/the-events-calendar or perhaps consider the purchase of one of our premium plugins to get access to premium support ?
With that in mind, it looks like the issue comes from the fact that your different menus are expanded somehow (including the mobile menu) by default, causing an issue with the display.
Try different settings under Events -> Settings -> Display to see if that helps.
Try temporarily reverting back to a default WordPress theme such as twenty-sixteen to see if the issue persists.
Best regards,
Geoff B.