images not showing in multisite subdomain

Hi Im running a multisite in different languages:
https://littlemissflex.com (USA / main domain)
https://littlemissflex.no (Norway subdomain; rootfolder: https://no.littlemissflex.com)
https://littlemissflex.se (Sweden subdomain; rootfolder: https://se.littlemissflex.com) and
https://littlemissflex.dk (Denmark subdomain; rootfolder: https://dk.littlemissflex.com)

All of the sudden some of the images are not working on the danish site, ( https://littlemissflex.dk ) the just show up as blue question marks. It′s only just started and the sites has worked fine until now and all of the same images works fine in all the other sites and subdomains/sites, with the same images and the same settings, plugins, same theme, and I′ve tried uploading the same image several times and sometimes they work on the danish site and sometimes they don′t, even though its exactly the same image file in the exact same place. There is no logic to this what so ever. I tried deleting my safari log and cookies but only for the last day, and that did not help.

When I refresh the page sometimes more of the images show up, and then when I refresh again they disappear and leave the question mark again.

I had other people look at the site to check if its just my internet connection or computer but they get the same thing… Can anyone please help me here? I read other threads about similar problems but none of them make any sense to me. Im at a loss on what to do..