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Image resizing unexpectedly

Hi everyone, newb to Webflow here. I’m having a stubborn problem with a png image within a lightbox suddenly transforming into a tiny thumbnail after publishing. It appears correctly in preview and read only, and I cannot for the life of me figure out what’s going on. I tried rebuilding the section from scratch, replacing it with a module that works elsewhere without issues, and resizing the original image, with no luck. Any help would be much appreciated. Here’s the read-only link:

Here is my site Read-Only: LINK
(how to share your site Read-Only link)