Exclude post properties from being overwritten during Advanced Content Templates template load.

gistfile1.php

<?php // do not include opening PHP tag

// You can put this in your theme's functions.php file
add_filter('act_protected_properties', 'my_protected_properties');

function my_protected_properties($protected_properties) {
	$protected_properties[] = 'post_title';
	
	return $protected_properties;
}