I get most of my books from Amazon and convert them to epub.
This time I tried with an epub I downloaded from Standard Ebooks (I found this site in this forum).
They render the chapter header differently. I checked Calibre and it renders it the same way than KOReader:
Does the stock kernel ignores font-variant: small-caps;?
Why I is cursive? It should be bold according to the styles
It also ignores some other margin stuff.
I know you always clean the epubs to make them look like you want, so you can tell me what is going here.