on testing your contact form, with error reporting enabled, i see the following error:
Warning: Cannot modify header information - headers already sent by (output started at /hermes/bosoraweb010/b80/ipg.agentsolarcomau/contactus.php:17) in
it is pointing to out put on the page around line 17:
output started at /hermes/bosoraweb010/b80/ipg.agentsolarcomau/contactus.php:17
causing the header function which is used for the redirect to fail.
the code at line 15 - 19:
<?php require_once("WA_Universal_Email/MailFormatting_PHP.php"); ?>
<?php $WAGLOBAL_Contact_Email_Subject = "Agent Solar - Contact Form Response" ; ?>
<?php
has blank lines between php code blocks at line 16 and line 18.
there should not be any blank line, space or other between a closing php tag:
?>
and the next opening php tag:
<?php
so that code at 16 - 19, should be:
<?php require_once("WA_Universal_Email/MailFormatting_PHP.php"); ?>
<?php $WAGLOBAL_Contact_Email_Subject = "Agent Solar - Contact Form Response" ; ?>
<?php
i edited that to correct the redirect issue.
attached are properly updated copies of the WA_ValidationToolkit/WAVT_Scripts_PHP.php and WA_Universal_Email/MailFormatting_PHP.php files to fix the deprecated error messages.