So all the "Add to Cart" buttons are working fine - when I add another item to the cart, it still remembers the other items that should be in the cart. But when I click the "View Cart" button, however, it says that the shopping cart is empty.



Could someone explain how to fix that, or why it's happening? Preferably in a way that a newbie will understand.



Here is an example:

http://studentsforjustice.ca/sfjc/store/dropbeatsnotbombs.php



Thank you in advance for your help!