mobile navigation links not clickable

I’m using the startright free theme and noticed that when the navigation is showing the responsive/mobile navigation, the main nav links that have sublinks won’t click. I’ve tried it in Firefox and Chrome on desktop, and Chrome on mobile and get the same issue. Here’s the site I’m using it on:

https://otpnet.staging.wpengine.com/

For example, the first three links have submenus. When the mobile version is applied, the primary links won’t jump to the page. Any ideas on how to fix this?