Why is new embedding option not working on Wordpress?

When copying source codes from Jotform onto my Wordpress website, it's not working properly. Used to never have a problem before the change last month.

I've also tried copying 'light box' code and it doesn't work either.

Hi,

Can you try embedding your form in your site using JotForm wordpress plugin and see if it will help? You can also try to embed your form using the iFrame embed method. You can check this article to know how to get iFrame embed code: Getting the Form iFrame Code. If the issue still persists, can you provide to us the exact URL where you have embedded the form so we can further check the issue. 

Do let us know if you need further assistance.
Regards.