I think I located that one. Compared to good paragraphs, problematic paragraphs contain more than a class/style indication. They go like:
Code:
<p class="txt"><dfn class="calibre3"><a id="pg_55"></a>La première fois que je suis entré au dépôt remonte à deux ans.
or
Code:
<h1 id="calibre_toc_2" class="calibre10"><a id="TOC_idp29967616"></a><a id="TOC_idp29967760"></a>RACHEL
Once I removed the <a> tag in the first case and moved RACHEL before the <a> tag in the second case, the text alignment rule was respected. The <a> tag before the text breaks some style rules for some reason.