Code displaying with email submit embed

Hi,

I just installed hustle on my website and it looks great but when I add the shortcode to my post, a little bit of code displays underneath it which doesn't look so great.

I've granted support access to the website if needed

blog post: http://www.pbnbutler.com/21-experts-share-1-tip-generating-traffic-blog/

Issue: http://i.imgur.com/3QQzxa2.png

The blog post is live so it'd be great if you could take a look at it as soon as you can. Thank you so much in advance!
kind regards,
Luke