Program: 84927
Project: 84927
Buggy source:
public void onKill(player killed,int reason){
  s.incStat(Stat.KILLS);
  kill++;
  s.maxStat(Stat.MAX_KILLS,kill);
  if (reason == 2 || reason == 7) {
    s.maxStat(Stat.FURTHEST_KILL,(int)killed.p.getLocation().distance(p.getLocation()));
  }
  if (reason == 7) {
    s.maxStat(Stat.FURTHEST_HEADSHOT,(int)killed.p.getLocation().distance(p.getLocation()));
  }
  if (inv) {
    s.incStat(Stat.INVULNERABLE_KILLS);
  }
  if (killed.nick.equalsIgnoreCase("String_Node_Str")) {
    s.awardAchievement(Achievement.KILL_GIG);
  }
 else   if (killed.nick.equalsIgnoreCase("String_Node_Str")) {
    s.awardAchievement(Achievement.KILL_NOTCH);
  }
  if (reason <= 3 || reason == 7) {
    addStreak();
  }
  int ammo=0;
  for (  ItemStack i : p.getInventory().getContents()) {
    if (i != null) {
      if (i.getType() == Material.FEATHER || i.getType() == Material.ARROW) {
        ammo+=i.getAmount();
      }
    }
  }
  if (ammo == 0 && reason == 1) {
    s.awardAchievement(Achievement.LAST_RESORT);
  }
  if (killed.streak == 10) {
    s.awardAchievement(Achievement.CLOSE_CHOPPER);
  }
  if (killed == lastk) {
    lastk_count++;
    if (lastk_count >= 3) {
      s.awardAchievement(Achievement.NEMESIS);
    }
  }
 else {
    lastk=killed;
    lastk_count=1;
  }
  if (killed == plugin.game.getTopPlayer(t == team.GOLD ? team.DIAMOND : team.GOLD)) {
    lastk_top_count++;
    if (lastk_count >= 3) {
      s.awardAchievement(Achievement.FALL_HARD);
    }
  }
 else {
    lastk_top_count=0;
  }
  if (reason == 7) {
    hshot_streak++;
    if (hshot_streak > 3) {
      s.awardAchievement(Achievement.HOTSHOT);
    }
  }
 else {
    hshot_streak=0;
  }
  if (reason == 1) {
    melee_streak++;
    if (melee_streak > 3) {
      s.awardAchievement(Achievement.COMMANDO);
    }
  }
 else {
    melee_streak=0;
  }
switch (reason) {
case 1:
    knife++;
  break;
case 2:
arrow++;
break;
}
}

Fixed version (ground truth):
public void onKill(player killed,int reason,Object l){
  s.incStat(Stat.KILLS);
  kill++;
  s.maxStat(Stat.MAX_KILLS,kill);
  if (reason == 2 || reason == 7) {
    s.maxStat(Stat.FURTHEST_KILL,getDistance(killed,(Arrow)l));
  }
  if (reason == 7) {
    s.maxStat(Stat.FURTHEST_HEADSHOT,getDistance(killed,(Arrow)l));
  }
  if (plugin.game.floc.containsKey(l)) {
    plugin.game.floc.remove(l);
  }
  if (inv) {
    s.incStat(Stat.INVULNERABLE_KILLS);
  }
  if (killed.nick.equalsIgnoreCase("String_Node_Str")) {
    s.awardAchievement(Achievement.KILL_GIG);
  }
 else   if (killed.nick.equalsIgnoreCase("String_Node_Str")) {
    s.awardAchievement(Achievement.KILL_NOTCH);
  }
  if (reason <= 3 || reason == 7) {
    addStreak();
  }
  int ammo=0;
  for (  ItemStack i : p.getInventory().getContents()) {
    if (i != null) {
      if (i.getType() == Material.FEATHER || i.getType() == Material.ARROW) {
        ammo+=i.getAmount();
      }
    }
  }
  if (ammo == 0 && reason == 1) {
    s.awardAchievement(Achievement.LAST_RESORT);
  }
  if (killed.streak == 10) {
    s.awardAchievement(Achievement.CLOSE_CHOPPER);
  }
  if (killed == lastk) {
    lastk_count++;
    if (lastk_count >= 3) {
      s.awardAchievement(Achievement.NEMESIS);
    }
  }
 else {
    lastk=killed;
    lastk_count=1;
  }
  if (killed == plugin.game.getTopPlayer(t == team.GOLD ? team.DIAMOND : team.GOLD)) {
    lastk_top_count++;
    if (lastk_count >= 3) {
      s.awardAchievement(Achievement.FALL_HARD);
    }
  }
 else {
    lastk_top_count=0;
  }
  if (reason == 7) {
    hshot_streak++;
    if (hshot_streak > 3) {
      s.awardAchievement(Achievement.HOTSHOT);
    }
  }
 else {
    hshot_streak=0;
  }
  if (reason == 1) {
    melee_streak++;
    if (melee_streak > 3) {
      s.awardAchievement(Achievement.COMMANDO);
    }
  }
 else {
    melee_streak=0;
  }
switch (reason) {
case 1:
    knife++;
  break;
case 2:
arrow++;
break;
}
}