Not showing error message or thankyou message in ie , safari , chrome

Hi There,

Here is page of contact form. All is work on Firefox but Not showing error message or thank you message in ie , safari , chrome.

https://www.propertysearch4u.com.au/contact-us
wordpress ver: 3.6.1.
genesis framework uses with child theme enable.

need help.

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