My screen goes full black after completing the attached form

After completing this form, my screen goes full black.

 https://form.jotform.com/aawpmiller/clean-tec-energy-solutions

Hi there,

I have followed your test selections in the form, and I was redirecting to the following page:

https://app.clickfunnels.com/for_domain/www.littletheaternorthofboston.org/make-appointment?updated_at=c5c12bc399c87b3a6569856df9f2b785v2&track=0&preview=true

It is not blank for me. 

You have two conditions in the form that redirects to a custom thank you a message. It's not blank either.

I think you have sorted this already. If not, please provide us with more information regarding this problem such as how to replicate it.