It is common buffs that gives everybody reflect...
Marching Drum
For 5 min., all party members' Atk. Spd. +40%, Casting Spd. +30%, Damage Reflection +10%, and Skill Cooldown -10%
Daring Sonata
For 5 min., all party members' Atk. Spd. +40%, Casting Spd. +30%, Damage Reflection +10%, and Skill Cooldown -10%
You can't remove NPC version of these buffs anymore(and Mentor Version is constant as long as the mentor is logged in)... just the Box/Live ISS buffs can be removed, or you could decide to leave them off your Buff macro altogether.