Mobile Calendar Issues

So with my website I’m using Simple Calendar on:
https://fmrvrt.org/fmrvrt-events/

I absolutely love it. Simple is right!

But my issues is coming with the mobile view. The black dots show on the dates where there is an event but when you click on that calendar date there are no popups. It doesn’t work on desktop either when the browser is shrunk to mobile size, and it doesn’t work on my or the clients phone.

I’ve turned off all cache plugins, and the server cache is off as well.

Any ideas?

The page I need help with: [log in to see the link]