Problem with contact form

Hello,
I’m using the contact form on this website http://www.marisa-spose.it, at these page http://marisa-spose.it/i-nostri-consigli/ and http://marisa-spose.it/contatti/ . Each time, however, fill out the fields and I click the send button wheel keeps turning but never send the completed form. The theme is Avada, last version .Someone can help me?