Web Form submission message freezes on Zoho Recruit

Web Form submission message freezes on Zoho Recruit

Web Form submission message freezes. After information submission through the Candidate Registration webform the form freezes with Submission Message and a gray background. Clicking OK button does not close the submission message or the page does not go to the landing page. 

Web address of this form:

http://www.nukepros.com/#!contact-us/hldab

Please refer to the attached screen shots. This website is live with high traffic, any prompt help will be highly appreciated. Thank you.