I am using the embed checkout code for tickets to my event at
http://www.loumongello.com/momentum/, (I am using Elementor page builder and Custom HTML code widget) but for some reason, it only shows a white box with the "
Get tickets for this event on Eventbrite" text and ticket button.

Every now and then it shows up OK, but most of the time it's this.
Any ideas?
Thank you!