Config files doesn't updates

I'm developing a prison ranks plugin, so I made that the plugin create 3 config files. One for the config and the ranks list file, one to keep the rank of each player and the last for keep the tracks list. When I perform the command "rankup" in the config file of players data the player rank updates itself, but when i perform for the second time the command "rankup" plugin rank up me to the same rank. For example:
Default track:
1: Default
2:Second
3:Third

Player Ranks:
player: Default

after performing command "rankup":

Player Ranks:
player: Second

after performing command "rankup" for second time:

Player Ranks:
player: Second

after performing command "rankup" and after reloading the plugin:

Player Ranks:
player: Third

How can i solve this problem?

 

else if (cmd.getName().equalsIgnoreCase("rankup")) {
UUID SenderID = (Bukkit.getServer().getPlayerExact(sender.getName())).getUniqueId();
try {
conf.load(config);
track.load(Tracks);
pdata.load(PlayerData);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
} catch (InvalidConfigurationException e1) {
e1.printStackTrace();
}
String Rank = Main.getPlayersData().getString("Players."+SenderID);
String PlayerName = sender.getName();
double balance;
World Null = null;
if(args.length == 0) {

if (RankupwithoutspecifyTrack = true) {

String DefaultTrack = Main.getConf().getString("Settings.DefaultTrack");
int posintrack = Main.getConf().getInt("Rankslist."+Rank+".positionintrack"+DefaultTrack);
int rankuprank = posintrack + 1;
String NewRank = Main.getTracksConf().getString("Tracks."+DefaultTrack+"."+rankuprank);
double Cost = Main.getConf().getDouble("Rankslist."+NewRank+".cost");
String rankPermNode = "PrisonRanks.rank."+NewRank;
if(Main.getTracksConf().getString("Tracks."+DefaultTrack+"."+rankuprank) != null) {
if((econ.getBalance(PlayerName) - Cost)>= 0) {

pdata.set("Players."+SenderID, NewRank);
try {
pdata.save(PlayerData);
} catch (IOException e) {
e.printStackTrace();
}
econ.withdrawPlayer(PlayerName, Cost);


perms.playerAdd(Null, sender.getName(), rankPermNode);
sender.sendMessage("§aYou ranked up to "+NewRank+"!");
return false;
}else {
sender.sendMessage("§cYou don't have enough money!");
return false;

}
}else {

sender.sendMessage("§cYou reached the end of the track!");
return false;
}
}else {
sender.sendMessage("§cSorry you have to specify track!");
return false;

}
}

 

How i make that the plugin keep that in the cache?