Popups suddenly not working

I installed Popup Maker on a client’s site a couple of days ago and it has worked great, doing just what I hoped it would. But my client recently made some changes to pages and now Popups are not working anywhere in the site. I don’t understand how her edits to individual pages could cause the popups to not work throughout the site.

The problem can be witnessed here: https://www.dailytransformations.com/popup-test/, by clicking the link “Open Popup”.

The Demo examples are also not working in the Help section of Admin.

Any advice would be appreciated. Thank you.

https://www.ads-software.com/plugins/popup-maker/