SOME images not loading on mobile


I’m building a design portfolio and want to ensure that it’s responsive. However, I’m having trouble with images loading on mobile. My portfolio project pages were built using a CMS collection.

For some reason, once I get one project page’s images to load correctly, at least one of the other page’s images will not display. This doesn’t add up as I’ve used image classes when building the site. I’ve read through other forum pages trying to follow others’ advice there and have tried to minimise file sizes throughout but still stuck.

Any help would be greatly appreciated. Thanks!