[Scandal]

Thanks! With your comments I fix it!
On template BLOG, I find:

<!-- Description -->
<if condition="$blogheader['description']">
     <div id="blog_description">$blogheader[description]</div>
</if>
<!-- End Description -->

And I add:

<!-- Description -->
<if condition="$blogheader['description']">
   <table style="clear: both;"><tr><td>
          <div id="blog_description">$blogheader[description]</div>
   </td></tr></table>
</if>
<!-- End Description -->