In some case it is needed a different API key for the Google maps. 

So please:

1. Generate an API key from here https://developers.google.com/maps/documentation/javascript/get-api-key 

2. Place your API key in the related field in Theme Options > Map Options.

Alternative solution with the child theme

1. Generate an API key from here https://developers.google.com/maps/documentation/javascript/get-api-key 

2. Use the child theme to add one of the following functions according to the theme you are using:

//Blade Theme
function grve_child_map_scripts() {
 wp_register_script( 'blade-grve-googleapi-script', '//maps.googleapis.com/maps/api/js?key=API-KEY', NULL, NULL, true );
}
add_action( 'wp_enqueue_scripts', 'grve_child_map_scripts' );

//Osmosis - Reload
function grve_child_map_scripts() {
 wp_register_script( 'grve-googleapi-script', '//maps.googleapis.com/maps/api/js?key=API-KEY', NULL, NULL, true );
}
add_action( 'wp_enqueue_scripts', 'grve_child_map_scripts' );

3. Place your API key in the API-KEY space you see in the function.