No grouped items on OrderRepositoryInterface

I try to get all products items from MagentoSalesApiOrderRepositoryInterface but i get simples products instead of grouped product. Everything is right with configurables

$criteria = $this->searchCriteriaBuilder
            ->addFilter('created_at', $from, 'gteq')
            ->addFilter('created_at', $to, 'lteq')
            ->addFilter('store_id', $storeId,'eq')
            ->addFilter('status', $status,'eq')
            ->create();

$orderResult = $this->orderRepository->getList($criteria);

$orders = $orderResult->getItems();

and then i get items with

        foreach ($orders as $order) {

            $items = $order->getItems();
        }

same result with getAllVisibleItems()

also on database there are only simple products however, indicated as grouped