Hi,
I made some tests and I found the issue in HikaShop.
Please edit the file : "administrator/components/com_hikashop/classes/shipping.php" and replace
	$order->shipping_warehouse_id = $key;
	$dispatcher->trigger('onShippingDisplay', array(&$order, &$rates_copy, &$group_usable_methods, &$errors));
	unset($order->shipping_warehouse_id);
	foreach($group_usable_methods as $method) {
		$group->shippings[] = $method->shipping_id;
		$method->shipping_warehouse_id = $key;
		$usable_methods[] = $method;
	}By
	$order->shipping_warehouse_id = $key;
	$dispatcher->trigger('onShippingDisplay', array(&$order, &$rates_copy, &$group_usable_methods, &$errors));
	unset($order->shipping_warehouse_id);
	foreach($group_usable_methods as $method) {
		if(isset($method->shipping_warehouse_id) && $method->shipping_warehouse_id != $key)
			$method = clone($method);
		$group->shippings[] = $method->shipping_id;
		$method->shipping_warehouse_id = $key;
		$usable_methods[] = $method;
	}I'll fix the issue.
I've also submit the fix to the HikaShop team ; they should update the package soon.
Regards,