Thank you for fast reply. Iam telling about the simultaneous click. If two or more customer click add to cart same time. Then more than one customer get product in there cart and no one can checkout. I clicked add to cart from 3 devices simultaneously then two devices got product in cart. And one device shows out of stock. When click checkout in one device which got product in cart it shows some error. To create the issue kindly click add to cart from 2 or more devices simultaneously. Hope you understand the situation. If you need any video or screenshot kindly reply.
