Amazon slipping

Two nights ago I finished the graphic novel "52 vol 1," which I had bought at a used bookstore. Then last night I got one of those spam recommendations from Amazon, suggesting I purchase "52 vol 3." Not volume 2, volume 3. Do they think I want to jump ahead like that. Now it's true, I did seriously consider buying volume 2 the other day at that same used bookstore, so it's possible Amazon took that into account. But still, they should really get on the ball.