Mac Safari, form sometimes work and sometimes doesnt

I am building this site which was coded by another developer who used gravity forms earlier, now i have switched from gravity forms to contact form 7, the form functionality works on all browsers of windows but doesn’t work on SAFARI for MAC, i am unable to find the issue in the code. If anyone can check out the site at http://bankruptfilms.com/ and can suggest what the issue might be, that would be really helpful.

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