Hey there creativebridge. Thanks for the follow-up there. I took a look at the plugin and unfortunately it looks like this is an issue you’ll need to bring up with their devs: it does appear as though there is an issue with how the popup handles custom post types, versus the standard/built-in WP pages/posts.
Sorry I couldn’t offer more help here. If their devs are able to point you in the right direction on that front, it should get you where you need to be – and if they have questions from us to help on that end please let me know so I can get them what they need.