[Resolved]  Flipkart — out of stocking after adding into the cart

The worst online shopping store is flipkart, disappointed many customers.
Every time when i add the redmi note 5 pro into the cart and than as soon as possible i go for checkout, but what i see is horrible.
How can any product go out of stock after adding it into cart within the fraction of second.
This same thing happened to me twice in a row.
Why flipkart allow us to add this into the cart, if they want to remove it out from the cart again.