Images never loading in lightbox

Using Venobox plugin for modal pop ups. On the page indicated, there is a carousel slider below the video – each slide has a “read more” link which opens an inline modal window, which contains an ACF wysiwyg field – which has an image in the content. The lazy load script seems to be finding the images in the modals, but they never load, all I get is the spinner. NOTE: I have added the a3-notlazy class to the first slide’s image and now that image loads. But that’s not really a solution because I want all those images to be lazy loaded (for page speed). Any ideas? Thanks in advance.

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