Emdashes and justification: Kindle overrides?

Scrivener Scrivener for Windows
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1

When compiling out to EPUB3, my emdashes get replaced by double hyphens. Is this a Kindle thing that overrides my settings?

Same is true for justification. I compile a left-justified document, and it appears fully justified on Kindle.

2

As for justification, Scrivener should be able to compile either justified or left-aligned. Kindle should be able to show both layouts as well.

Is your default formatting left aligned or justified?
Do you apply a style to left-aligned text, that is not imported into the Compile Styles list?

What properties has the CSS-class in the stylesheet used for the e-book? If text-align: justified; is there, update it to text-align: left;

HTH