Plugin Interfering with Gravity Form Submission

I was successfully using the Popups – WordPress Popup plugin that is no longer supported. Then I transitioned to using this plugin and everything was working.

With the last update, I’m guessing, (around July 7th) the popup still opens and shows my Gravity Forms form (via shortcode) but when the submit button is clicked there’s a quick “processing swirl icon” and then the popup closes but the form never submits and the notification message isn’t displayed. I have tested the form by placing it on the page not in a popup and it works correctly. It only doesn’t work in the popup. How can I fix this? It’s costing me lots of donations that aren’t being submitted. ??

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