If your popups aren’t appearing as you expect, the most common cause is that the popup is not enabled for the page.
Check two things in Display Settings:
1. The “Show for all posts and pages sitewide?” option is checked.
2. The “All Pages” and “All Posts” are NOT checked under “Show this popup on which posts/pages?”.
Popup only on a page or a few pages?
You will want to check to see if you only have your pages you want it on checked and the ‘Show for all posts’ is not checked.