Your login page still has:
$Authenticate->addFilter("email", "=", "s", "".((isset($_GET["email"]))?$_GET["email"]:"") ."");
$Authenticate->addFilter("password", "=", "s", "".((isset($_GET["password"]))?$_GET["password"]:"") ."");
it needs to use $_POST like:
$Authenticate->addFilter("email", "=", "s", "".((isset($_POST["email"]))?$_POST["email"]:"") ."");
$Authenticate->addFilter("password", "=", "s", "".((isset($_POST["password"]))?$_POST["password"]:"") ."");