Hi @himanshpahwa ,
You can kindly check if the caches are kept while performing the Buy Now or not. I tested on your site and it seemed that the cart was not reloaded properly when pressing the Buy Now button.
If your site is using AJAX add to cart, kindly install this plugin to assist it: https://www.ads-software.com/plugins/wpc-ajax-add-to-cart/.
I’m not sure why it’s not working on your site, probably due to an external conflict there. You can try debugging by deactivating all other plugins except WooCommerce and our plugin to check the Reset Cart. Then reactivate other one by one to find the culprit.
We test on our test site and live demo with the latest version of WooCommerce, WordPress, WPCStore theme and our WPC plugins, the Reset Cart feature is working properly. You can check my video here: https://app.screencast.com/KlGgdQwDFwmqd. So maybe there is an external element on your site affecting it.
Best regards.