Events Calendar a mess

Hi,

I’ve been using the plugin “The Events Calendar” for a while, but when I installed it into the new site I’m working on with the Evolve theme, it shows up a mess.

Normally it gives a really nice calendar (see: https://www.ebenezershi.com/events/ for a good example). In my new site, it looks like this.
https://retireesunite.org/events/month/

Why?

Thanks,
Ben