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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 took a look at your form and I can recreate the same issue where I am shown a blank page after submitting the form.
Looking into the form, I see why that happens. The reason why it did is because you have set your conditions to show empty thank you page on the submit if the name (which is required field) is filled out - which means that it would show it like that every time.
Removing the condition will allow you to see the thank you page once again.
Do let us know how it goes.