The badly formatted books tend to be older catalog titles. My wife never sees this problem either - but she tends to a lot more bestsellers and popular fiction than I do.
Example: check the reviews for Anne McCaffery's Dragonriders of Pern anthology. It is really terrible. Apparently the print book version was also sourced from bad scans/OCRs also though because there's a ton of errors in that also.
So not just an ebook problem.