deleted books appear again

I have the exact same problem. I reported it in the past, I've researched solutions, but Adobe is not doing anything to solve this annoying problem. It does not make sense, with all the engineers they have, that years later, this problem is still not solved. So either some engineers at Adobe are playing babyfoot, enjoying nice mokachinos and laughing at us stuck with a broken application OR they receive a directive from incompetent managers to forget about users because, after all, they are just stupid users who cannot use any other software to borrow books from their local libraries...

Check if has the eBook also in the My Digital Editions Folder in his Documents.