By what means are you calling it a bug? When we type the formula "combo=(str+agi+Ene)/x" don't expect the exact same damage when you add str with the one when you add agi or Ene. And I'm not saying that the Str is the best for damage, I'm saying that this is MU from Webzen, and unless you can give us source Code access, please, just play
Thank you for understanding!