problem formatting tag

Hello,

I use CKeditor4 in drupal 7 and I have a problem switching to HTML tag.

If I want a structure like this:
<li> <a href="#"> <img> <h2> title </ h2> </ a> </ li>

Ckeditor me into
<li> <a href="#"> <img> </ a> <a href="#"> <h2> title </ h2> </ a> </ li>

Yet I put config.allowedContent = true;

How can I do to remove this filter.

thank you