Even books as well-written as Apocalypse Parenting seem to have typos every 3-4 pages. What gives?

Just dived into it a couple days ago, now into book 3. The book 1 typos were fairly rare, but they've gotten progressively worse. Now in book 3 they're nearly omnipresent, with some of them being so bad I don't even know what to suggest in a report.

>>!I do hope Airman Stevens can him or bring one of the others to Fort Autumn for a more extended exchange.!<

No idea what that's supposed to say exactly. I'm assuming it's a missing word between can and him.

I know they've got to be using professional editors for these books. And the author themselves is fantastic. I'm a shrewd reader, for sure, so I expect to catch a typo now and again, but this has gotten a little ridiculous. I even found a word (which I don't remember exactly, unfortunately) that had an errant letter in it that would absolutely have been caught by basic spellcheck. That was when I finally stopped passively ignoring them and started using the Kindle report function.

Why are these books riddled with errors?

Edit: another example a few pages later. Literally anyone reading this would catch it instantly, including the author.

>You need anything, y break one and I’ll check in on you.