We killed Alysrazor just as the second set of eggs hatched, but we were just below the minimum overall damage required for a "valid" kill. Note that we did 51495513 damage to the boss according to the log, and there is a death event for Alysrazor:
With many groups killing the boss in only one Burnout on 10 Normal, the minimum damage required for a kill to be marked valid should be adjusted.[20:23:47.593] Alysrazor dies
EDIT: Added information about the death event and how much damage was dealt to the boss so that admins don't have to sift through everything.