Logs from that fight are always broken because of wonderful phasing -.- you think blizzard would realize that and fix their shit :( Basically as long as you were in my realm (up top p3) your dmg is accurate, if not get fucked.
EDIT: Just look at the last one on the list for the kill, because we don't get to see all dmg to the boss WoL can't properly track it for anyone -.-