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I would agree with what everyone has mentioned about a typo in the CSS somewhere.
But I also wanted to caution you about giving "epub looks great in Sigil BV" very much significance in the first place. It's alright for getting a ballpark idea that things are generally the way you want them, but I wouldn't spend a lot of time fine-tuning/tweaking layouts in Sigil's Book View. Only because it's using a renderer that most dedicated eReaders simply don't use.
I'm pretty sure that in this case (like the others have mentioned), the differences are due to the fact that there's an error causing ADE to abandon your CSS, but I assure you the opposite can happen, too. You can have an ePub that renders fine (correctly) in ADE, but not in Sigil's Book View. ADE is still the measuring stick to go by, in those instances—in my opinion.
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