Textarea on contact form not working

I did a contact form with the form builder widget of site origin. Also it contained a text area to type a message. When I checked the form after on the website, i was not able to type any text in the text area. The field appeared and also all the other fields worked correctly. Only by clicking the text area field, nothing happend. No cursor appeared an I was not able to type any text into it. I am using the Flash Theme from Theme Grill.

An suggestions to solve this problem?

Thanks a lot,
Manuel