you had the from address bound to the Name field in the form.
I chanbged it in the webassist/email/waue_contactus_1.php from:
$MailFrom = "".((isset($_POST["Contact_me_group_Name"]))?$_POST["Contact_me_group_Name"]:"") ."";
to use the email address form element instead:
$MailFrom = "".((isset($_POST["Contact_me_group_Email"]))?$_POST["Contact_me_group_Email"]:"") ."";