SEO strange behavior

Hi

strange behavior when the seo areas are not filled with the title.

If title is not mentioned it "should" take the default one, so the post title. It does it well, BUT it adds twice by default the sitename in this case.

http://hippocampe.passion-cheval.net/les-copains/pakita-la-morue/

look this page I let areas empty for the example.

is it normal ?

(huh no more sreen possible in posts ? )