Terms and Conditions Empty Popup

My terms and conditions popup is blank: www.pdsmemphis.org/register/after-school...ividual-registration
It's linked to an article that is accessible: pdsmemphis.org/terms-and-conditions

If you'll pardon a moment of user interjection I happen to jump over just to see what your site looks like and the problem you're having so I could be on guard for it. And I click the more sessions are available when you do that that comes up with a 404 error not sure if you knew that or not.

Thanks for the heads up on the 404. I reworked my site completely and am still finding old links that I need to refresh.

iframe source link there doesn't contain any article ID. That's the reason.
May be there's no article mentioned in the config, or it could be the result of incorrect php code editing in registration form template here:
\components\com_eventbooking\view\register\tmpl\default.php