Contact Form

Dear all I am using Adventourus Pro, the contact form does not work. I tried Contact Form 7 (the one you recommend). It does not display the form - only the letters. I installed other contact programms, but they do not work either. The page I am talking about is: www.chirurgie-prager.at I have a programmer; but he could not solve it either. Do you have an idea what the problem is. Best regards