Problem about configuration post title

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Hi
i try to optimise my blog to search engin, with All In One SEO Pack Plugin, but i have a problem :

My configuration in Keyweord Settings section is : %post title% | %blog title%, but when i add a new article and i open the article page, the title that i have is just the (post title + |), means i have no blog title after the |.

NB. i already have a blog title in the settings.