I just got a quality email as well, on my book 3. 8 issues, 7 of which were typos, and 1 where they dont understand the context of the sentence, and so it isn't a problem.
Done the changes, uploaded already.
I suspect someone who 'edits' as they read has just started my series. Books 1 and 2 were re-edited last year, but 3 is 4 years old now, and still reflects my lack of experience back then. No surprise someone found 7 typos after all this time.
But I suspect I'm going to be getting a string of these as this person reads the series, and keeps reporting typos.
All good.
And only finding 7 (of 8, since I found another instance of one of them) is a good indication even back then, I wasn't making too many mistakes.