Solved Change block position not working

Hey guys, what's up?

I'm creating a plugin that has a machine, this machine digs tunnels, get ores and some other things, in minecraft, this machine is represented by a DISPENSER block, in my code, i created a object for the machine called 'Mineradora', and another class that manage to control all the machines on the world. the manager class, has a runnable that calls the act() method of all machines.
On code below, you can see what the machine can do until now:

Code (Text):

    public void act() {
        Bukkit.broadcastMessage(combustivel+"");
        if ( hasCombustivel()) { //if has fuel
            move(getDirection());
            dig();
            burnCombustivel();
        }
    }

What's my problem: Everything is working fine, but about 2 or 3 schedulers, the machine's block just diseappear, and when this happen, the machine don't dig anymore but continue to burning fuel:

(ps: block moves position normally)
After few schedules:


This is the code where i change the machine position:

Code (Text):

    private void changePosition(int x, int y, int z, BlockFace direction) {
        Block old = this.b; //the b variable is the machine block
        Block newB = this.b.getLocation().add(x, y, z).getBlock();
        this.b = newB;
        this.loc = newB.getLocation(); //the loc variable is the machine location
        newB.setType(Material.DISPENSER);

        // MaterialData d = newB.getState().getData();
        // org.bukkit.material.Dispenser disp = (org.bukkit.material.Dispenser)d;
        // disp.setFacingDirection(direction);

        old.setType(Material.AIR);

    }

(and if it's need, here is the all machines scheluders

Code (Text):

package com.master.skyMineradora.maquina;

import java.util.Iterator;

import org.bukkit.scheduler.BukkitRunnable;

public class MaquinaRunnable extends BukkitRunnable {

    private MaquinaManager mm;

    public MaquinaRunnable(MaquinaManager mm) {
        this.mm = mm;
    }

    @Override
    public void run() {
        if (mm.getMaquinas().size() > 0) {
            Iterator<Maquina> it = mm.getMaquinas().listIterator();
            while (it.hasNext()) {
                it.next().act();
            }
        }
    }
}

I don't know why after some position changes the block just diseappear, can anyone please help me?

 

In front on my eyes, the block just move 2 or 3 times (and when move, it's like x+1 or z+1) and disappear.

 

Yes, as you can see, the direction actually does nothing, i made the code to move the block direction turns a comment, i was thinking that was the cause of the bug, but i was wrong haha. So the block just move from location to another location, i set the old location type to air and the new location no dispenser, and made the variables changes in my object aswell

 

Feeling stupid guys

The block is actually teleporting
But err.... In a wrong location



ty for the help, my bad!