Articles in feed are duplicated

When i open this feed in browser it displays single articles as expected, but when I add it in Newsblur - most of the articles are duplicated.
Feed - www.sport-express.ru%2Fservices%2Fmaterials%2Fnews%2Fse%2F
Feed Newsblur link - http://www.newsblur.com/site/6253539/

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I’m not sure but I think is because the article is re-posted.