[Plugin: WordPress SEO by Yoast] Problem with the titles…

Hello Everyone,

I’m having a problem with the plugin, i set my title on posts as %%title%% – %%sitename%% but it’s not working… you can check it out at http://www.williamrufino.com.br/

my site name is “William Rufino – Desenvolvedor Web”

and its not separating the title right……..
ie:

this page:
http://www.williamrufino.com.br/o-lado-profissional-e-empreendedor-de-sem-por-alberto-andre-uaiseo-2011/

the title is:
O lado profissional e empreendedor de SEM por Alberto André UaiSEO 2011

and sitename is “William Rufino – Desenvolvedor Web”

but the title is : O lado profissional e empreendedor de SEM por Alberto André UaiSEO 2011William Rufino – Desenvolvedor Web

Why is that happening?

Sorry about my english, I’m a little rusty :/

http://wordpress.org/extend/plugins/wordpress-seo/