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When getting the response for character progression, the Heart of Fear raid returns duplicate entry for Garalon.
This is known and is listed on the website bug list (it appears this way on the website as well): http://us.battle.net/wow/en/forum/topic/2483738534
The fix is unfortunately more involved than we would like but we are working on it.
We'd like to keep issues on this github repo related to the documentation and not about the API itself.