Shopify Dawn theme - Adding products in cart even out of Stock

Hi, I am having a problem in one of my stores. The theme is Dawn. I need to lock down the items when they are not in stock. I have checked off the option which says : continue selling when out of stock. But even then my products are adding in cart.

Please see the screenshot. How can I fix this. Is there some code then let me know.

https://247iiey5bkng19g9-59757035709.shopifypreview.com/

Hi @Humaid ,

This is usually coded in natively in the Theme, have you modified anything regarding that? If not, can we request collaborator access so we can have a look at that?