I'm the one missing something, but I don't know how to explain it, obviously, sorry.
Is this the difference in the custom ad versus the standard ad?
When I create an ad I click sponsored products. Then I can pick Custom Text or standard text. This all changed recently, but I have been doing custom text, which I thought was one step closer to the nice ads people create themselves, which I am very uncapable of doing.
I don't know if you can see this link:
https://www.amazon.com/Storyteller-Jodi-Picoult-ebook/dp/B008J48RA4/ref=sr_1_1?s=digital-text&ie=UTF8&qid=1547602797&sr=1-1&keywords=the+storytellerUnder The Storyteller there is a rectangular box ad, for a book called the The Hired Man.
That is the kind of ad I have been doing. I'm 99% sure because they show me the ad when I create the campaign, and it looks like that, not like what you see in the sponsored products carousel/row.
Maybe it is different in the US and the UK? Thank you for trying to help me, but please don't waste anymore time on this if you are busy. I can ask support. They probably groan when they see my name come up, and draw straws to see whose turn it is to deal with the uberidiot, but they do get back to me, eventually.
Thank you, Amanda