I have delete Graphene theme (some code was edited) and I have installed without change any file and the problem were the same with the original graphene theme.
I don’t understand why WP adds this char, menu is normal.
Edit: If I delete ‘Noticias’ this code appears over next menu element…
Edit 2: Editing line by line style.css error has desappear.
Thanks for your help, your work doesn’t better work with Wp.