Not sure if this helps but the error for me is with the show/hide reCaptcha section of the JS.
if ( thisOpen == false && jQuery('.contact-form textarea').val().length > 0 ) {
thisOpen = true;
jQuery('.g-recaptcha').css('display','block').delay(1000).css('opacity','1');
}
console says Uncaught TypeError: Cannot read property ‘length’ of undefined but yet in the part above this it uses a similar statement.