Featured image of custom post types not opening in lightbox

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Hello!!

On my website I use regular built-in Posts and two Custom post types (via ACF free). I also use a lightbox plugin (Easy FancyBox – WordPress Lightbox Plugin by FirelightWP).

All works well, every images loads in a lightbox on-click/press, except featured images of one specfic Custom post types (featured images of the other custom post type and of regular posts *do* open in the lightbox as expected).

Anybody have a clue why that is?

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