It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
There can be many reasons for this. Try to sign in to your Adobe account in the browser. You can also try changing the password. NB!Adobe will not allow you to have more than one Adobe ID. If you forget your user ID, do not create a new ID with the same personal data. This could cause your ID to be blocked.
Your Adobe ID can be activated with a maximum of 6 apps/devices. If you reach the limit, you will have to deactivate your ID from some of the apps (app settings->deactivate)
With iPad, use Safari for downloading books. Other browsers may cause trouble when downloading the book file.
How to download an Ellibs book to an iPhone/iPad (the same goes for an Android device)