Woocommerce add product url

Hi
on this site http://vrf.s159.upress.link

on homepage scroll all the way down and click on link as in image attached

the link is to http://vrf.s159.upress.link/cart/?add-to-cart=469quantity=1

now if a customer clicks here and then instead of immediately checking out decides to refresh or lets say they chose 3 in quantity and wants to change to 2 this doesnt work.

I hope you guys at WPMU DEV can please assist to solve this.

Thanks

adding screen shot