Do you mean the aggro radius? If so, can you tell me what your config value
is set to for creature.aggro and can you also give some examples? Make sure
you're using the .dist command.
Creature aggro behaves like same level (NPC 50 and Player 50) 20 range
aggro. Each level difference between player and npc is -1 yard about. So a
level 60 player would have 10 yard range aggro, this is blizzards way of
handling aggro range.