Hi. I am getting a similar problem. I only have my iPhone and my browser app. When I logged in a week ago I got a message saying that I have my account open in two iPhones (I only have one), so I revoked the access to one of them (the unused one). A week after, I am logging in and I get the same message as if I was using another iPhone and I am forced to revoke the device again (last time I can do it this month). Is this because of a flaw in the device detection or is it a strategy to get you to subscribe to a premium account?