The children display macro will render all of its content as children of an otherwise redundant h2 element, e.g.
<div class="innerCell">
<h2 id="ComputerGamesDevelopment-ConceptsandIdeasArchitectureGamesTemplatesGlossary"><ul class="childpages-macro conf-macro output-block" data-hasbody="false" data-macro-name="children"><li><a href="/display/CGD/Concepts+and+Ideas">Concepts and Ideas</a></li><li><a href="/display/CGD/Architecture">Architecture</a></li><li><a href="/display/CGD/Games">Games</a></li><li><a href="/display/CGD/Templates">Templates</a></li><li><a href="/display/CGD/Glossary">Glossary</a></li></ul></h2><p><br></p></div>
which seems to be utterly wrong. Why is there the containing h2 element at all?
Would it not be more suitable to make it a div instead, or eliminate that container altogether as it is totally redundant?
N.B.: this will not happen always, especially if you have already placed headers in your page. it will only happen if you have no headers at all, i.e. a page without any content other than the inclusion of the children display macro.