Books borrowed/bought since several years pop up in ADE

I resurrected an older Notebook which had not been used since spring 2019.

I was amazed that ADE - newest version, which I had not loaded down - showed books aquired between 2017 and today! Those I bought can be downloaded, for the other the usual time-up notice pops up.

The same happend on my Iphone 8 which I bought just two months ago.

The Computer on which I normally use ADE was shut off - and I am sure I had deletet all borrowed bools

How come?

And how and where can I get rid of the old files?