It could be a lot of things, from how Sigil displays it, how the reading system you're using displays it, to what the structural markup is or what the CSS has to say about the structural markup.
You're definitely going to have to understand (X)HTML and CSS. Fortunately, it only seems complicated until you get how they relate to each other -- which doesn't take long to figure out.
You'll be fixin' 'em in no time.
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