I was preparing to order several books last night; added them to the cart, carefully looked over the entirel list to ensure everything was correct, then proceeded to checkout. Only there did I notice that I actually added the same book to my cart twice, luckily before I actually placed the order. How did I miss it earlier?
Well, turns out the way the counts are displayed in the cart (on the 'www.' part of the site, not the 'store.' part) is extremely confusing.
For each row in the cart, there's a thumbnail, and in the upper right corner of the thumbnail a (1) is overlaid on a little circle. This would appear to be the number of the item in question. Wrong! In the body of the row, I see "2x $19.95" in a more muted font colour, and this is the real count.
It's very easy to assume the (1) in the thumbnail corner is the item count, after all, what else could it be? The page element even has the class "product-thumbnail-quantity"...
Suggestion to either make the number work correctly, or remove it entirely.