In order for the locations to display on the map, these must be marked in the map editor:
  1. Navigate to the WordPress Dashboard.
  2. Select WP Google Map Pro > Manage Maps.
  3. Click to Edit the map.
  4. Scroll down in the editor to Choose Locations.
  5. Mark the checkbox under Select to include all locations you would like displayed on the map.
  6. Click Save Map.