Contact form is freezing

Hi,

I have a weird problem on this website: http://claus-fetterlein.dk/kontakt-os/

When I’m clicking on the fields in Safari for Mac the form is freezing and I can’t write anything and I can’t move to another field. It’s only happening in the three first fields, the message (the last one) is working fine.

It’s a bit different in Google Chrome. When I want to write anything in the fields it’s sort of freezing, but I can still write. I can’t see what I’m writing, but it becomes visible when I go to the next field.

In Firefox everything seems fine though.

I hope you get the time to look at this. Thank you and have a nice day.

https://wordpress.org/plugins/contact-form-7/