There are no php file processing done for some forms as the action="" attribute is empty. Examples:
1) "<form action="" method="post" id="signupFormPart2" name="signupFormPart2" style="display: none;" data-type="">"
2) "<form action="#" method="post" class="signup-form" id="signupForm" name="signupForm">"
3) "<form action="" method="post" id="signupFormPart2" name="signupFormPart2" style="display: none;" data-type="">"