Wordpress Isotope Search Fix

I need someone to work out why the isotope search filter on this page is not working but the category filter is. I'm not certain it's an issue with the javascript - It might be the custom post type isn't allowing search, But I've checked CPT UI and it seems to be set up correctly. The site uses the Oxygen plugin rather than a theme but I'm 95% sure it's nothing to do with that.
https://staging-intelligentreachwww.kinsta.cloud/platform/our-partners/
As you can see the category buttons work as expected but the search filter returns no results.
Thanks,
Mat
Isotope code is in the test attachment