Image Links/Files Not Working after PHP Upgrade/Downgrade

Hi I’m having a strange issue I hope someone can help with:

We have a cPanel server with about 10 WP sites on it, today I upgraded the php version to 7.1, which was fine for all of the sites, except for this one:

https://artmuseum.unm.edu/collections/painting-sculpture/

It basically broke the site where it wasn’t displaying page content on the front end, even though it was all still on the backend. I descalated it back to 5.6 just for this site, and everything came back on, however, the images are all broken and will not load on the front-end, despite the code pointing to the correct directory and file.

Now, if I manually type in html code to the editor, they still will not work, i.e. however, if I use the “add media” button, and go find the exact same image, and use insert into post, suddenly the image will work, as it does now on the top of page: https://artmuseum.unm.edu/collections/photography/

I have tried disabling all plugins to no avail, I renistalled the latest version of wordpress, and I switched to 2017 theme and they still show up as broken links. I installed Health Check and it didn’t seem to reveal much either, the permissions on the uploads directory look correct, and I am out of ideas…

Any help or suggestions would be appreciated so I don’t have to go re-insert every image on the site. It is an older theme to be sure, about 6 years old I would imagine at this point.

thanks everyone

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