Hi Jeremy,
We are using the latest version on the plugins.
The Grace Christian site is very large (bigger than 2GB). I’ve included a login below for the staging site…you’re welcome to take a look, or do a duplicator download directly.
We run Events Calendar Pro on another website that looks like it has the same issue. I open the full calendar page, click the next month twice, and it exports August events instead of what’s displayed on the page. Here is the link: https://www.kenaitze.org/calendar/
We use WPEngine. One other commonality is that both sites use Genesis. I also believe both site are on PHP 7.
Thanks for looking into this further.
Paul