Oh... thx for the explanation, now I understand it.
After reading your message I thought about the description in the offers.
Each offer has its own description. I wanted to add some information about alternative trade possibilities for the offered item.
As test I added in each of my both offers a description (A: Poleaxe for money, B: Poleaxe for a Sword). I tried to open offer B, and got - as you explained - offer A. But I saw in the offer details the description of offer B. I did not see the description of offer A.
So the potential buyer cannot read all information about the offers.
Edit:
I was not completely right. You can see both descriptions, but you have to click at first at offer B (to read description of B and details of A) and then at offer A (to read description of A and details of A). But imho a little bit confusing.