The same thing happens to me quite a bit.
I will set the Part One to H1 and then set the Chapters to H2. The first part will work properly. But then Part Two though set the same as Part One (H1 and Chapters set at H2). It will show in the TOC like I have set Part Two and Chapters as H1.
I do all this manually since I don't know a lick of html.
Going to go see if a ticket was ever created.
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