That has been a problem since the beginning of ebooks --- I happened to be browsing the Sony e-book store on a day when they offered a $10 credit, so I bought a copy of Heinlein's _Space Cadet_ --- it was so badly formatted and so riddled with errors I had to go to a library to consult a print copy so as to fully enumerate all of the typos in it. Since then I was issued a check for the price-fixing lawsuit, and that purchase was transferred over to a different e-book store where there was a better copy (though I haven't had occasion to re-read it since).

That said, I've found at least one typo in every ebook I've read, even _Dune_ which I didn't get around to buying until it had been available in the Kindle store for _years_ ("pogrom" was mis-rendered as "program" and there was a formatting error in the glossary). I've been reporting all them using the interface, but not sure if they ever get fixed...

That said, it's not limited to electronic texts --- my second printing of J.R.R. Tolkien's _The Fall of Arthur_ also had a typo in it, but at least for that I was able to reach an editor at the publishing house who assured me that it would be corrected in later printings.