Finding image, but not sorting

Weirdly, this is working on two thirds of my pages

but on this page in particular (one of many)
https://www.moreorlessmag.com/fashion/what-happens-when-life-gives-you-lemons/

BackgroundCheck.init({
  targets: '.fixed-nav, .fixed-nav, .fixed-nav, h1.h1',
  images: '.hero, .wp-image, .thumbnail, .size-full',
  debug: true
});

This returns a "Sorted: False" and I don't know why, as it's reading the images...

Any ideas?

[cylott]

Me too!