Hi @fahadurrehmankhan1,
Just to check, are you referring to the price shown on the single product page (screenshot from your site for reference: https://snipboard.io/zh64yA.jpg)?
If so, that’s seemingly the default behavior. Even on a test site using the Storefront theme, changing the quantity does not cause the price shown on the product page to change, it will keep showing the price of 1 item. When you add the items to the cart, you will be able to see the total cost of the product price * quantity on the cart page.
However, if you would like the price to be updated with any quantity change, you could get in touch with a developer or the WooCommerce Customizations Experts to write a script for that.
I hope this helps.