Hi. Temporaral solution is:
a) cut the table tag after main tbody
b) cut
tag for total raws in result of function $this->getTotalHTML($fields, $totals),
line 855
// $html .= "</tbody></table>";
<------>$html .= "</tbody>"; // avoid closing current table to save column width in total raws
// $html .= $this->getTotalHTML($fields, $totals);
<------>$html .= substr( $this->getTotalHTML($fields, $totals), 7); // trim starting 7 chars of tag <table> tag to avoid une
$html .= '</div>';
result:

Alex