I have probs with adding items.
For example i make LIMBO trade. Adding 1 tf2 key to the first withlist (http://upyourpic.org/images/201310/amtjqaxgp4.jpg), 1 dota2 key to the second one and when i add 1 csgo key to the third, the images of my LIMBO gift, tf2 and dota2 keys disappear (http://upyourpic.org/images/201310/lvrrx22p33.jpg). When i finally saving my trade the items i added are places in wrong order (http://upyourpic.org/images/201310/nhpay5etfx.jpg)

I have tested with exactly the items but do not run into the same problem as you.

At the end it does not affect the result though. The order of wishlist makes no difference anyway.