Warlords of Draenor hotfixes have been published the 07/28/2015 ! Here is the patch notes :
Patch 6.2 Hotfixes: July 28 (Source)
- Trading Post Level 3: The increase to reputation gain should now work correctly while in a Draenor dungeon or raid.
- Filling the Ranks: Players that have already completed the criteria to obtain this achievement prior to a hotfix from July 21st should now correctly receive credit for the achievement.