Use tweak book in calibre open the stylesheet.css file with a text editor. Look for line-height.
It should look like this:
line-height: 1.2;
not like this:
line-height: 1.2em;
if you have the "em" then remove it. I only use line-height in the body style, if the paragraph styles have a line-height then it may override the reader settings.
bernie
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