Lightbox not displaying on Review

I have created a "review stories" button which should show the slide 1.3 as a lightbox (see screenshot). It works on preview (shown below) but not after I publish it to Review. The other lightboxes in this slide work as expected. This seems to be inconsistent. Sometimes I can go through and close the lightbox, but after I submit a question (i.e., MC Environment, and then click "review stories", then close out, it does not return to the main slide. Instead, I see a white screen. Is this a review issue or some step I'm missing in the programming?