It looks like the redirect and the page is in there. The code may not be going into the block of code for forwarding, so what you can do to test is to find this block of code:
//Send Mail All Entries
if ("contact-thankyou.php"!="") {
header("Location: contact-thankyou.php");
}
and modify it to look like this:
//Send Mail All Entries
if ("contact-thankyou.php"!="") {
die("Forwarding block reached");
header("Location: contact-thankyou.php");
}
if the page just shows the text "Forwarding block reached" then it gets into that block of code, but its not forwarding correctly. If it does not, we'll have to look into why it isn't getting to the forwarding code.