Format: Photo Grid problem

Hi, I have a problem with Photo Grid, when I view my page the pictures still appear underneath each other. http://www.factum.one/horseventures/themes/drupal/Capture37.PNGhttp://www.factum.one/horseventures/themes/drupal/Capture38.PNG Kind regards, Wout Drupal version:  Drupal 8.x Source: https://www.drupal.org/taxonomy/term/22/feed