Unable to add Heise Developer Feed.

I want to add the Heise Developer Feed for this Site: http://www.heise.de/developer/
The Feed is: http://www.heise.de/developer/rss/new…
But i always get the Feed for the main site added.
Feeds for other Sites from Heise work normal. Like: http://www.heise.de/open/news/news-at…

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