There are a number of guilds who have completed SoO content either via flex guild groups or lfr guild groups but who have not completed the content on Normal mode yet, they are being reported on wow-heroes as having completed the content on normal.
This is probably happening across the board and I noticed this same glitch happen in Tier 14 & Tier 15 on my old server. I had hoped it would be fixed for this tier.
Armory reports these guilds as earning the achievement for clearing SoO but clearly shows that they have not downed Garrosh.
What can be done? Like many, I am on a highly competitive server where bragging rights = enhanced ability to recruit. Even if we complete normal Garrosh ahead of these other guilds, they will still be ranked above us because of this flaw.