I've only killed heroic madness 4 times, yet the armory seems to think I've killed it 6 times. Nothing major... But yeah. Heck I earned the achieve on 8/16. So killing it once every week since then is 4. Not 6. Just something I noticed, meaning there may be other problems in the kill tracking system somewhere.
Thanks for the report. I'm going to be attacking some of the raid progress bugs asap after MoP comes out. Sorry for the incorrect reporting until then.