i have written a small functionality, where i need to get data from XML or CSV and populate the data in the cart.

I am able to read the data from the file and create an array of the items

    foreach ($products as $productId => $singleQty)
        {

            $product = $this->productModel->load($productId);
            if ($product)
            {
                echo $product->getId() .'<br/>';
                $this->cart->addProduct($_product, array('qty' => $singleQty));
                $this->cart->save();
            }
        }

the echo result is completely fine, it displays the product Ids correctly

But only one item gets added into the cart, with the total number of items.

Suppose i have product IDs 2 and 4 with quantities 200 and 400 respectively,

the above snippet only adds product with ID 2, but the quantity added is 600 

Any idea what i am doing wrong?