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There is definitely space before —, or possibly there's a missing space behind —. Fooling with font setting won't fix your problem. Calibre viewer is not good for previews, try the file in "Kindle for PC" or in Kindle Create. Preview windows there usually work the same as on the reader later.
You could try to convert the file to kfx if that fixes the problem, or you could try figuring what goes wrong during the conversion. I guess that Calibre part of the forums would be a way to go for that.
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