Extra title output with this function wp_list_pages

ok, found the answer here : http://codex.wordpress.org/Function_Reference/wp_list_pages#Exclude_Pages_from_List

here is the core of the answer :

Markup and styling of page items

By default, wp_list_pages() generates a nested, unordered list of
WordPress Pages created with the Write > Page admin panel. You can
remove the outermost item (li.pagenav) and list (ul) by setting the
title_li parameter to an empty string.

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