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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 have checked form on this http://tk-design.nl/contact and it is working fine for me. Can you please check again i think there is no issue or it may have been resolved by someone else from jotform support team.
I checked the form and all fields are working well except the Uw namm field that does not accept any data insertion.
I tested the standalone version of the form and it is working properly, so I believe it is a script conflict. Embedding the form again will probably solve this situation. You can use the iFrame method:
Please let us know if we can assist you further.