It appears your site is experiencing a common CSS conflict with The Events Calendar,where a "prev/next" navigation icon (often a chevron or arrow) is inheriting a 100% width or height from your theme,causing it to blow up and cover the screen.
Here are three ways to fix this. Start with Option 1 as it is the most common fix for this specific issue.
Option 1:The CSS Fix (Recommended)
This code forces the navigation icons back to a normal size.
Go to Appearance>Customize>Additional CSS.
Paste the following code:CSS
.tribe-events-c-nav__prev-icon,.tribe-events-c-nav__next-icon,.tribe-events-nav-pagination img,.tribe-common-c-svgicon{width:20px!important;height:20px!important;max-width:20px!important}.tribe-events-nav-previous a img,.tribe-events-nav-next a img{width:24px!important;height:auto!important}@media only screen and (min-width:600px){.tribe-events-event-image{max-width:300px;float:right;margin-left:15px}}.tribe-events-single>.tribe_events{display:block}