No shortcode is generated

Hello

I installed the plugin, and added a PHP script, selecting “short code (Manual)” from the dropdown for Placement Method. but when I save the snipped, it reverts to “Automatic”, and no shortcode is generated (when i go to the snipped listing, the column “Snippet Placement” has nothing.

this is the code I have pasted:

<?php
require_once("conexion.php");
require("paginacion.php");
?>
<?php
$sql= "SELECT * FROM decesos";
$res=mysql_query($sql,$con);
$total = mysql_num_rows($res);
$pg = $_GET['page'];
$cantidad = 8;
$paginacion = new paginacion($cantidad, $pg);
$desde = $paginacion->getFrom();
$sql1= "SELECT * FROM decesos LIMIT $desde,8";
$res1=mysql_query($sql1,$con);
$url = "despedidas.php?";
$classCss = "numPages";	
$back = "&laquo;Atras";
$next = "Siguiente&raquo;";
$paginacion->generaPaginacion($total, $back, $next, $url, $classCss);


	while($row = mysql_fetch_array($res1))
	{
	?>
    <tr height="80">
    <td>
<p align="center" style="margin-bottom: -8px;"><img src="http://www.tanatoriossanantonio.com/wp-content/uploads/2014/06/cruz.jpg"; height="100"; width="75" /></p>
    <h3 align="center" style="color:#900"><?php echo $row["nombre"];?></h3>
	<h5 align="center">
	<?php
	echo $row["fallecimiento"];
    echo '<br />';
	echo $row["confortado"];
	echo "<br />";
	echo $row["entierro"];
	echo "<br />";
	echo $row["tanatorio"];
	echo ", sala nª:";
	echo $row["sala"];
	?>
    <div id="veresquela" align="right">
    <a href="http://www.tanatoriossanantonio.com/esq?id=<?php echo $row["id"];?>" style="text-decoration:none; color:#999">
    Ver esquela
    </a>
    </div>
 <div id="enviopesame" align="left">
    <a href="http://www.tanatoriossanantonio.com/envie-su-pesame/" style="text-decoration:none; color:#999">
    Envíe su pésame
    </a>
<img style="margin-top:-10px; margin-bottom: 10px;" src="http://www.tanatoriossanantonio.com/wp-content/uploads/2014/06/sep-falecidos.jpg" />
    <p />
    </div>
    <?php
	}
	?>
    </h5>
    </td>
    </tr>
    </table>
    <?php
$url = "despedidas.php?";
$classCss = "numPages";	
$back = "&laquo;Atras";
$next = "Siguiente&raquo;";
$paginacion->generaPaginacion($total, $back, $next, $url, $classCss);
?>

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