[support] hunting spurious <p>

Hi, I have a node whose content is html without '<p>', and a theme which does a print $content without adding '<p>'. However, when looking at the generated html I see *two* '<p>' before the content. Of course, they are correctly closed, however it's a bit too much (and not html-compliant) and prevent from adding <p> in the content itself. Does anyone know where does that come from ? Thanks, Xav