Have a look at the structure of the mob_skill_db:
// Structure of Database:// MobID,Dummy value (info only),State,SkillID,SkillLv,Rate,CastTime,Delay,Cancelable,Target,Condition type,Condition value,val1,val2,val3,val4,val5,Emotion,Chat
The emotion field of the mob could be filled in, but also, have a look at the "@NPC_EMOTION" with certain monsters. Trying removing those types of lines from the mobs you're farming and see if it'll work.