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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
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