The process by which books are converted to Kindle format introduces errors which do not get corrected. Every publisher knows this, though none will say so on record. The problem is one of economics. The cost of a printed book covers some degree of proofing and checking—not enough, but some. The cost of a Kindle book does not support quality control, and the multi-step conversion process, handled in bulk by third parties, chops out content and creates other errors that no one fixes because no one is there to do QA.