What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I cloned your form and I checked the Thank You page. I can see that you inject XML inside the source code.
This is not allowed in the Thank You page. The scripts or XML tags will not work. It will be treated as a plain text.
If you like, you can redirect the Thank You page to a custom webpage where the XML is. Here's a guide: https://www.jotform.com/help/38-Redirecting-Users-to-a-Different-Page
Hope that helps. Thank you.