[Plugin: Contact Form 7] Green confirm box is not shown

Hi, i have wp 3.2.1 multisite with multidomain configured, all is ok, but if i try to send an email from CF7, when i press “send” the email is sended, but i see only the whaiting circle, and not the green box with the confirm, what i can do?

here the form:
https://www.celticsoul.it/prenota-online/

Thanks.

https://www.ads-software.com/extend/plugins/contact-form-7/