This is from the please wait you order are being processed... page
<input type="hidden" name="x_line_item" value="item1<|>Real aspen and Japanese maple leaves<|>a125 : real aspen and Japanese maple leaves<|>1<|>85.00<|>N" />
The Item Name is too long according to the http://www.authorize.net/support/SIM_guide.pdf page 46. It up to 31 chars and your is 36 in this example.
Yep, I try the a125 (maple leaves) http://www.lesbijouxboutique.com/necklaces/real-aspen-and-japanese-maple-leaves/ and it work fine all the way to authorize.net site.
And it seem the item name is still too long for other items.
One more thing. Is the green Add to Cart button suppose to do somthing?
It not that it will effect anything, it just that I didn't know why it didn't do anything when I click on it since it was right in the middle. Then, I see the small add to cart on the bottom.
It just a distraction and people might not know to scroll down to see the other(real) add to cart button.