добавил tbody:
$res.="<tbody><tr>
<th class=\"table_header\" width=\"70\">№</th> <th class=\"table_header\" width=\"160\"> </th> <th class=\"table_header\" width=\"160\">Адрес</th> <th class=\"table_header\" width=\"160\">Стороны <img style=\"vertical-align: middle; margin-left: 20px;\" src=\"images/side.png\" alt=\"\" /></th> <th class=\"table_header\" width=\"390\">Информация</th>
</tr>";
...
$res.='</tbody>';
Но не помогло