When I buy on Amazon I have to be careful that it’s being delivered to the correct device (for some reason, default is my wife’s tablet) . Did you check that?
My thought too. I own more than one kindle and sometimes books get delivered to the wrong one unless I specify it to be delivered to the correct one. I just got to the kindle content and have it delivered to the one I want. You can do that from your account.
Same problem here, my wife’s tablet is the default. You can get into the Amazon “manage account” area and change it ... but it changes back all by itself.