Ok I changed the doctype and still the same. I think Ken is right, i took of the bolded and i worked jsut fine,how can i do that.
heres the code that renders the menu for the children items from the module v=2 menu file children.html
<li {tag_menuitemidname_withid} {tag_menuitemcssclass_withclass}>
<a class="dropdown-toggle" data-toggle="dropdown" href="{tag_menuitemurl}">{tag_menuitemlabel}</a>
<ul class="dropdown-menu">
{tag_menugroup}
</ul>
</li>