This page can’t load Google Maps correctly.

that’s because you haven’t set up your API key properly. Inspecting your javascript console reveals this error:

You must enable Billing on the Google Cloud Project at https://console.cloud.google.com/project/_/billing/enable Learn more at https://developers.google.com/maps/gmp-get-started

Google requires you to setup a billing account to use gmaps js libraries which this plugin does to be able to insert location information on an interactive map.