Conflict in Header with Events Calendar plug-in

I have the Events Calendar plug-in on my Smpl Skeleton theme site.
https://www.ads-software.com/support/plugin/the-events-calendar

I am encountering a problem with using IE or Firefox. When you go to an events page, all the links in the header area of the webpage no longer work. For example – https://test.tc2host.com/events/

I opened a support ticket with the Events Calendar plug-in (https://www.ads-software.com/support/topic/disables-links-in-header-area) and they believe it is a problem with the theme. This is what they said:
This could very easily be an issue between your theme and the plugin. For instance if your themer’s header.php is including function calls that should go inside content.php, then anytime a plugin like ours rewrites the loop it will wreak havoc.

Please help!