Amazon.com, where is your submit order button?

I’ve placed 5 orders at Amazon.com in the past week and noticed some strange things. The “Next” or “Submit Order” buttons on some of the screens during the order process are missing. At first I thought it was a browser thing, but after placing orders on two different computers (at different locations) with both IE and Firefox, I think their site is a little messed up. Of course you can just press “Enter” to submit the form and go to the next page but this is bound to cause confusion for some/many. I wonder what’s up. The holiday season doesn’t seem to be a good time to push new code.