First column on the Guild live report represent number in wow-heroes data base ,Guild rank column represent your rank in the current guild .
But ... its not the case with your guild unfortunately since your guild is bugged on the armory
I feel your pain. I'm actually writing a letter to the President of Blizzard today because our guild has been a total mess in the Armory since last November when we had a problem Blizzard tech support fixed. Our individual members show as in our guild but when we look at the guild page it only shows people who were in the guild when the problem happened. and are NOT in the guild now. After 10+ months of using the REPORT ERROR feature and reporting it on forums and via Customer Support on Blizzard.com I'm taking it to the top. All they say is 'it's in beta' ... ya well it's time to birth the baby; how long is it gonna stay in Beta? And being in Beta doesn't mean you don't listen to problems and at least try to fix em. We have about 450 people in our guild but show about 10 (who again aren't even in it LOL).
As far as we checked wow-heroes have more valid info about your guild only because u checked some of the chars through Character report
Hopefully u will be able to fix that problem with Blizz soon and see your guild report the proper way