It's nearly impossible to tell--without seeing the html files--how some of those other classes (that also set font-sizes, and are NOT identical in the two css files) might be being applied. Setting your preferred font-size in the calibre1 class (assuming that's the "body" class) would not stop other paragraph classes from overriding it.
Also, make sure there's not a "style" attribute in the html tag(s) that sets a font size. I see that more and more (especially with epubs that started life as a kindlebook).
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However, in the book with the css set at 0.75em the text in sigil looks the same as the text in the book with the css set at 1em.
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Could it be that one of the "none1,2,3" classes is the standard paragraph class in that first (0.75em) one?