JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I believe you are working with this form (http://www.jotform.co/form/31572289455866) right?
I cloned the form and I did a test submission, I didn't encounter the problem. The Thank You page shows up immediately.
However, I was able to replicate the issue when I did a test submisison. In the console, I found an error about the Oembed.
Can you please try to re-embed the form on your webpage using the Iframe method. This will prevent script conflicts between the page and the form.
Related guide: Adding Forms to Wordpress org version
This is a courtesy response to your enquiry. We will respond to you within the next 24 hours.