A few cents (never more than a dollar) was automatically added to the stated purchase of every item I added to my shopping cart without any explaination. I returned to the offer page and each item was still listed at the original lower offer price in AU$. I could find no obvious explaination for this. Surely if the exchange rate had fluctuated between adding items to my cart and paying at the checkout., any such amended price should have been reflected when I returned to the items listing but that was not the case. A reasonable explaination would be appreciated.