My friend, there is so much here - I am losing track of the real issue.
As we posted in your other thread at http://www.guildox.com/wow/forum/thread/1284,
there was a bug and it was fixed just over 12 hours ago. It will take a day for all of the guilds to be updated so others may still be in queue to be corrected. It should settle down shortly.
That being said - the average is not just a simple "take the top 10 total and divide by 10". We only look at players that have logged in since the season started so if you have players that have not logged in for a while then they get ignored. There may also be a bug still kicking around so we will look into it further.
As for achievement points your guild has 1770 according to Battle.net: http://us.battle.net/wow/en/guild/Area%2052/FACEDOWN/ If you are seeing something different in game then you need to contact Blizzard support and get them to fix it on battle.net.
Finally - we are trying to help so be nice. Being nasty about all this will only get you banned.