In case the basket appears empty when product is added, please go back to the previous page and look up the basket icon in the top right corner.
It should show that there is an item inside. 
If the basket persist to be empty, look for pending updates for the internet browser that is used at the moment, install all if found then try to add the product to basket again.
Alternatively our support team is here to help you, please request their attention by submitting ticket.