Lightbox not working on iPhone

We are using the plugin to embed an Instagram feed in multiple locations on this site. Because of the theme we’re using (Stockholm) we’ve got it set up as a widgetized sidebar. It works great on desktop, and works fine in desktop Chrome set to mobile/responsive mode with the Inspector at phone size, but if you try it on Safari or Chrome on an iPhone, you’ll find that no matter which photo you click on, it displays the same image in the lightbox.

Not sure if it’s doing this on Android phones as well, since I don’t have one handy to test on at the moment.

Any way we can fix this? Thanks!

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