Thanks for clarifying this, to make the UE server behavior only occur when the content of your new specials page is updated via the contents_update page you will need to modify the trigger for the UE server behavior. You will need to check on the posted ContentGroup to see if it is equal to specials, it might look like this:
if (isset($_POST["Update"]) && (isset($_POST["ContentGroup"])) && $_POST["ContentGroup"] == "specials")