Maps not showing and multiple errors

Hi, I’m using your plugin for a couple of maps showing POI for an event.
https://www.libriincantina.it/informazioni-utili/
It’s from a few got problems: maps don’t showing and browser console signed me some problems like:

Uncaught ReferenceError: google is not defined
<anonymous> https://www.libriincantina.it/wp-content/plugins/wp-google-map-plugin/assets/js/vendor/infobox/infobox.js?ver=6.2.2:129

or

You have included the Google Maps JavaScript API multiple times on this page. This may cause unexpected errors.

Don’t know if those are the reason of the showing problem.
Curious thing is that when I try to check the page as a preview, map is working and instead when i look to the page normally, map is not showing

Any suggestion?
Thanks a lot in advance
Claudio

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