Just found another unbelievable "correction"... one that can be described without thereby revealing too much. Here goes.
Like philosophers often do, I employ an example that recurs throughout the book. The example involves two hypothetical people, to whom I give the names "Ann" and "Brian." "A" and "B," and the former is female and the latter is male. Get it?
Sometimes a paragraph will begin with something like, "Recall our example of Ann and Brian...." then I'll go into some refresher about the example, and introduce the next consideration. But the whole point of using proper names of different genders is to make it easy to use "she" and "he" ("her" and "him," etc.) in developing the examples.
My copyeditor decided to alternate between "he" and "she" apparently without any regard for the way the example is supposed to work. If one sentence about Ann uses "her," the next sentence uses "him," even if it's another sentence clearly about Ann.