Has this happened to anyone else?
A couple of days ago, I went to add my card details to Amazon (I'd had the card a while, but hadn't added it to Amazon as I was using another one), only to find it was already there. I assumed I'd added it and forgotten about it.
But then yesterday, my wife got a new card, and has just now seen it is already on our Amazon account, without either of us having added it!
Can anyone explain how this has happened?!