Images show up in thumbnails but not in portfolio

Good day fellow word press world, I am having trouble with my photos not showing up in the portfolio section of my word press website. The thumbnails work just fine in on the home page but when you click on one of the websites to view them in the portfolio they don’t show up. Please help. Thank you very much

arcademicmedia.com – click on one of the three websites at the bottom and they don’t show up