You could try updating the details page <td> where the update button appears to:
<td><input type="button" value="Update" class="formButton Sharp" id="Update" name="Update" onclick="document.location.href='prod_update.php?ID=<?php echo($row_WADAprod['ID']); ?>';" /></td>
That might solve the issue.... if not, just send me ftp access and a url to reproduce and I can fully debug and figure out what is going wrong.