I checked a lot but still not getting the case. which browser you are using ?
I checked with chrome and IE. And also checked with different devices.
Let me know.
Well, I checked your website in incognito mode in chrome and added product to the cart.
when I went to the cart it shows quantity box. After refresh it gone then I again refresh it came back.
I checked console, It has some js error maybe that is causing this issue.