This message in the italian translation is quite misleading:
#: inc/wpseo-non-ajax-functions.php:91
msgid "The post %s appeared first on %s."
Right now we got "L'articolo %s sembra essere il primo su %s." wich means "The post %s seems to be the first one on %s".
It should be something like "L'articolo %s proviene da %s."