I am working on a new MarketPress installation and things

I am working on a new MarketPress installation and things are going well except for the fact that the cart doesn’t seem to be working properly. You can add an item and it won’t immediately show up, if you add multiple items they will start showing up. Then when you delete an item it says it deleted it, however if you click cart again the item will reappear.

It is becoming quite frustrating.