shop/cartoption.php 파일을 수정하시면 됩니다.

<!--<input type="hidden" name="ct_send_cost" value="<?php echo $row2['ct_send_cost']; ?>">-->
<input type="hidden" name="sw_direct">
<?php
if($it['it_sc_type'] > '1' && $it['it_sc_method'] == '2') {
?>
<section class="tbl_wrap tbl_head02">
    <h3>배송옵션</h3>
    <table class="sit_ov_tbl">
    <colgroup>
        <col class="grid_3">
        <col>
    </colgroup>
    <tbody>
<tr>
<th><label for="ct_send_cost">배송</label></th>
<td>
<select name="ct_send_cost" id="ct_send_cost">
                        <option value="0"<?php if($row2['ct_send_cost']=="0") echo " selected"; ?>>선불</option>
                        <option value="1"<?php if($row2['ct_send_cost']=="1") echo " selected"; ?>>착불</option>
                        </select>
        <td>
        </tr>
    </tbody>
    </table>
</section>
<?php
} else {
echo "<input type='hidden' name='ct_send_cost' value='".$row2['ct_send_cost']."'>";
}
?>