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I checked your site and I was able to see the issue you are reporting. The submit button and some text at the bottom of form is not displayed properly on the website. It seems that the form is being cut-off on the website.
As per checking the site, you are embedding the form on a different page (http://www.7impronteaccademy.it/Sito/FireWalking_Manziana_files/widget2_markup.html) and then embed the page with form on the site (http://www.7impronteaccademy.it/Sito/FireWalking_Manziana.html).
On this page - http://www.7impronteaccademy.it/Sito/FireWalking_Manziana_files/widget2_markup.html, I noticed that you are embedding the form using the <script> code, can you try to re-embed the form to the page using the iFrame embed code of the form and see if this will fix the issue? To get the iFrame embed code of the form just follow the instructions provided in this article: Getting the form iFrame code.
If the issue still persists, please try to embed the form directly to your site (http://www.7impronteaccademy.it/Sito/FireWalking_Manziana.html) using the iFrame embed code instead of embedding the form on a different page.