We're only getting half of a form appear on our page

Hi! We have followed the steps above which are very easy to understand! However, we are only getting half a form appear on our page! I can't figure out how to expand it so the whole form appears. Any advice you have would be great! Isla

I embedded one of your forms to our test wordpress.com website. However, I am unable to replicate the issue. I can scroll down the form page. Please check my result:

Would you mind to share the URL of your website so that we can inspect it in detail?