Help Understanding Code Not Working

Hello,

Below is code that is not allowing some data to show on screen, and also not inserting data to database. But first I would like to correct the data not showing to screen and possibly that will solve my other issue. What thing I do not understand, is the below code works fine on a server running on (Linux 2.6.18-374.3.1.el5.lve0.8.44), (MySQL 5.0.92-community), and (PHP Version:    5.2.17 (Zend: 2.2.0)).

Code does not work correctly on (Linux 2.6.18-274.3.1.el5.centos.plus), (MySQL 5.0.77), (PHP Version:    5.1.6 (Zend: 2.1.0)), Just curious why it does not work here? Would like to know for my knowledge.

<?php

if (isset($_POST['Update']))
{

    $sppc_query_raw = "select * from " . TABLE_CUSTOMERS_GROUPS . " order by customers_group_id";
    $sppc_query = tep_db_query($sppc_query_raw);
    while( $sppc = tep_db_fetch_array( $sppc_query ) ) {


     if ($sppc["customers_group_name"] != "Retail"){
//$sppc['customers_group_id']

    $c = "CG_".$sppc['customers_group_id'];

    $tmp = $_POST[$c];

    if ($tmp != 0)
    {

    $p = (100-$_POST[$c])/100;

    tep_db_query("delete from products_groups where customers_group_id = ".$sppc['customers_group_id']);




    tep_db_query ("insert into products_groups select '". $sppc['customers_group_id'] ."' as customers_group_id, ( " . $p . " * p.products_price) as customers_group_price, p.products_id from products p");



    }  //if not 0
    }  //if not Retail

    }



}


?>

<!-- body //-->

<table border="0" width="100%" cellspacing="2" cellpadding="2">
  <tr>
    <td width="<?php echo BOX_WIDTH; ?>" valign="top"><table border="0" width="<?php echo BOX_WIDTH; ?>" cellspacing="1" cellpadding="1" class="columnLeft">

    </table></td>
<!-- body_text //-->
    <td width="100%" valign="top"><table border="0" width="100%" cellspacing="0" cellpadding="2">
      <tr>
        <td width="100%"><table border="0" width="100%" cellspacing="0" cellpadding="0">
          <tr>
            <td class="pageHeading"><?php echo "Special Pricing Discount Setup"; ?></td>
            <td class="specialPrice" align="right"> </td>
          </tr>
        </table></td>
      </tr>




      <tr>
        <td><table border="0" width="100%" cellspacing="0" cellpadding="0">
          <tr>
            <td valign="top"><table border="0" width="100%" cellspacing="2" cellpadding="2">
              <tr class="dataTableHeadingRow">
                <td class="dataTableHeadingContent" align="left">
                <?php

                if (isset($_POST['Update']))
                {
                    echo "<center>Updated!</center>";
                }

                ?>
                 </td>

              </tr>
<?php


    $sppc_query_raw = "select * from " . TABLE_CUSTOMERS_GROUPS . " order by customers_group_id";
    $sppc_query = tep_db_query($sppc_query_raw);

    while( $sppc = tep_db_fetch_array( $sppc_query ) ) {

?>

              <tr class="dataTableRow" onmouseover="rowOverEffect(this)" onmouseout="rowOutEffect(this)">
                 <td class="dataTableContent" align="left">

                  <?php

                  if ($sppc["customers_group_name"] != "Retail"){

                      echo $sppc["customers_group_name"];

                  }

                  if (isset($_POST['Update']))
                  {

                        if ($sppc["customers_group_name"] != "Retail"){

                        $c = "CG_".$sppc['customers_group_id'];

                        $tmp = $_POST[$c];

                        echo " Current Discount is $tmp%" ;


                        }
                  }
                  ?>


                  </td>

              </tr>

<?php
     }
?>
        </table></td>
      </tr>

      <tr>
       <td valign="top">
       <form action="" method="post">
        <table border="0" width="40%" cellspacing="0" cellpadding="2">

              <tr>
                <td class="smallText" align="left"> </td>
                <td> </td>
              </tr>
<?php

    $sppc_query_raw = "select * from " . TABLE_CUSTOMERS_GROUPS . " order by customers_group_id";
    $sppc_query = tep_db_query($sppc_query_raw);
    while( $sppc = tep_db_fetch_array( $sppc_query ) ) {



    if ($sppc["customers_group_name"] != "Retail"){

?>

              <tr>
                <td class="smallText" align="left">Set New Percentage (%) Discount for <?=$sppc["customers_group_name"]?> :</td>
                <td><input name="CG_<?=$sppc['customers_group_id']?>" type="text" size="5" value="0"></td>
              </tr>

<?php
              }

     }
?>

              <tr>
                <td colspan="2" align="center"><input type="submit" name="Update" value="Update"></td>
              </tr>



        </table>
        </form>
       </td>
      </tr>

    </table></td>
<!-- body_text_eof //-->
  </tr>
</table>
<!-- body_eof //-->

I attached two images, Screen 1 is correct screen view, and Screen 2 is missing some of the data, this is on the current machine. I highlighted in yellow the missing data.

Thank you for all the help,

DB