Media Disappeared from Album Page

I noticed that all photos disappeared from album pages. On some pages like the link above the images seem to be hidden but if you hover mouse pointer over white space below cover image you can click and image shows with no arrows to navigate. On other pages like https://www.allstarplastics.com.au/portfolio/domes-displays-acrylic/ the images are missing completely

The page I need help with: [log in to see the link]