English RSS feed show non-English posts.

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I am unable to post my question because I don't have enough Karma and link contains the key to the problem. So please check my problem here. Basically, I get non-English posts in English feed.

ask.fedoraproject.org/en/question/51881/rss-feed-includes-non-english-posts/

I am subscribed to Ask Fedora feed using the link below.

ask.fedoraproject.org/en/feeds/rss Removed http because I am not allowed to post links.

Seeing that en I would expect it be the English language feed but I regularly receive non-English posts in my RSS reader.

Am I using the wrong feed? Is it a bug in Askbot?