1) not all of the cart columns will be added to the cart display by default.
When you add the cart display manager, the second step will allow you to specify which cart columns are added to the display. If you want to show them all, you will need to add them when creating the cart display using the Display Manager.
2) It sounds like all items are using the same ID.
Can you send a copy of your page so I can see how you have configured the add to cart buttons.