Additional 'tax_included' taxes are created every time an order is saved.

uc_taxes hook_order does not take into account the new 'tax_included' tax type.

If the line item is not summed(not added to the total), it receives the "tax_included" type.

function uc_line_item_tax($op, $order) {
  switch ($op) {
    case 'load':
      $lines = array();
      $taxes = uc_taxes_calculate($order);
      foreach ($taxes as $tax) {
        $lines[] = array(
          'id' => (isset($tax->summed) ? 'tax' : 'tax_included'),
          'title' => $tax->name,
          'type' => (isset($tax->summed) ? 'tax' : 'tax_included'),
          'amount' => $tax->amount,
          'weight' => variable_get('uc_li_tax_weight', 9) + $tax->weight / 10,
          'data' => $tax->data,
        );
      }
      return $lines;
  }
}

However, hook order checks for new/existing taxes based on the following

          if ($line['type'] == 'tax') {

Because of this, a new line item is added to the order every time the order is saved, if the tax is a non-summed tax(VAT).

Attached is a patch to resolve the issue.