Images are not loading

Dear support team

There are two problems on my website. I’m not able to reproduce them in Chrome’s developers mode simulating a mobile device. If I access my website in private mode on my iPhone sometimes images are not loading. The space where they would load stays empty. Sometimes they load after a reload.

The problem often occurs opening this page
https://www.emerging-art.net/kuenstler/philipp-schoch/
and then click on one of the artworks bottom of the site.

Thank you very much for any support in advance!

Best,
Marco

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