Forgot to clear at setup.

src/com/massivecraft/mcore/util/PlayerUtil.java

@@ -43,6 +43,8 @@ public class PlayerUtil implements Listener
 	
 	public void setup()
 	{
+		lowercaseToDeath.clear();
+		
 		joinedPlayerNames.clear();
 		for (Player player : Bukkit.getOnlinePlayers())
 		{