Registration form not working

Hello,
the Registration form on my website is not properly working in the way that every time I try to register and klick on the register button, the register form renews itself and is leaving my Information in the spaces, but leaves the password space blank.
I am not receiving any activation or welcome e-mails.

I would very appreciate help,

Thank you !

The page I need help with: [log in to see the link]