Program: 164467
Project: 164467
Buggy source:
public void add(Buff buff){
  buffs.add(buff);
  Actor.add(buff);
  if (sprite != null) {
    if (buff instanceof Poison) {
      CellEmitter.center(pos).burst(PoisonParticle.SPLASH,5);
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Amok) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Slow) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof MindVision) {
      sprite.showStatus(CharSprite.POSITIVE,"String_Node_Str");
      sprite.showStatus(CharSprite.POSITIVE,"String_Node_Str");
    }
 else     if (buff instanceof Paralysis) {
      sprite.add(CharSprite.State.PARALYSED);
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Terror) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Roots) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Cripple) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Bleeding) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Sleep) {
      sprite.idle();
    }
 else     if (buff instanceof Burning) {
      sprite.add(CharSprite.State.BURNING);
    }
 else     if (buff instanceof Levitation) {
      sprite.add(CharSprite.State.LEVITATING);
    }
 else     if (buff instanceof Frost) {
      sprite.add(CharSprite.State.FROZEN);
    }
 else     if (buff instanceof Invisibility) {
      if (!(buff instanceof Shadows)) {
        sprite.showStatus(CharSprite.POSITIVE,"String_Node_Str");
      }
      sprite.add(CharSprite.State.INVISIBLE);
    }
  }
}

Fixed version (ground truth):
public void add(Buff buff){
  buffs.add(buff);
  Actor.add(buff);
  if (sprite != null) {
    if (buff instanceof Poison) {
      CellEmitter.center(pos).burst(PoisonParticle.SPLASH,5);
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Amok) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Slow) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof MindVision) {
      sprite.showStatus(CharSprite.POSITIVE,"String_Node_Str");
      sprite.showStatus(CharSprite.POSITIVE,"String_Node_Str");
    }
 else     if (buff instanceof Paralysis) {
      sprite.add(CharSprite.State.PARALYSED);
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Terror) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Roots) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Cripple) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Bleeding) {
      sprite.showStatus(CharSprite.NEGATIVE,"String_Node_Str");
    }
 else     if (buff instanceof Sleep || buff instanceof MagicalSleep) {
      sprite.idle();
    }
 else     if (buff instanceof Burning) {
      sprite.add(CharSprite.State.BURNING);
    }
 else     if (buff instanceof Levitation) {
      sprite.add(CharSprite.State.LEVITATING);
    }
 else     if (buff instanceof Frost) {
      sprite.add(CharSprite.State.FROZEN);
    }
 else     if (buff instanceof Invisibility) {
      if (!(buff instanceof Shadows)) {
        sprite.showStatus(CharSprite.POSITIVE,"String_Node_Str");
      }
      sprite.add(CharSprite.State.INVISIBLE);
    }
  }
}