Map is not displayed properly

if there is an error in browser's console stating:

Google Maps API error: MissingKeyMapError

you need to create a google maps api key as described in this article:

https://developers.google.com/maps/documentation/javascript/get-api-key

Make sure you authorize the contact page url containing the map when you create the key.

then go to theme options -> map options -> google maps api key and paste it there