Not with ebooks as I am careful with checking before purchase.
But in my carefree younger years, it happened quite a few times when I purchased pbooks now to read later or simply to complete a collection, so it would be quite some time before I realised "oh damn, I already have this". Somehow I have ended up with 4 copies of Dune. Don't ever remember buying them, but there they are in my boxes of books. Maybe they were gifts??
Have been get caught out with re-released titles eg Asimov's I, Robot and The Rest of the Robots, which were then combined and re-released as The Complete Robot. Yep the publishers fooled me with that, as is exactly their intent.
Being gifted books I already have adds to many duplicated pbook titles I already own.
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