It looks like you had an API key but it may have been copied over incorrectly.
Your site is showing this error message: Geocoding Service: This API project is not authorized to use this API. For more information on authentication and Google Maps JavaScript API services please see: https://developers.google.com/maps/documentation/javascript/get-api-key
I have blanked out the keys, . I can see them using the Browser tools, inspect, under console. it showed that there were keys entered but they are not associated with the project. You need to add your credit card info on Google site to use the APi keys. You might be able to contact Google support for non profits to see if they have special rates for non profit organizations.
https://support.google.com/nonprofits/troubleshooter