@rosshalde - I make no claims as to having any expertise on this stuff.
But, if I had your 'problems' I would open the epub in the calibre ebook editor. It has a Live CSS feature that will display all the styling applied to a paragraph, division etc. Styling of a given chunk of HTML (such as paragraph) will typically be inherited (cascade) from multiple chunks within the style sheet(s).
I don't know if Sigil has a similar feature, I've not stumbled across it.
BR
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