Originally Posted by kovidgoyal
IIRC this happens when some paragraph is styled as center aligned and then the remaining text is put after that paragraph without any <p> tags of its own. In that case html2lrf assumes that the style for the subsequent text should be the same as for the previous paragraph.
This is exactly what I have seen with some eReader output converted to HTML. The center aligned tag is followed by a paragraph and then my multiple ugly <br> tags rather than <p> tags with effectively one <P> tag per chapter.
My fix was to correct the HTML with search and replace, but in secondary books I just removed the center align tags.