Android : Click next button in first screen but detected next for in second screen

I have a problem. I made a game with 2 menujema and playfield. When I hit the first menu button next to my senses as I pressed the button next to the other menus (buttons have the same coordinates). Now I wonder how this is possible?

import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.scenes.scene2d.Stage;

public class AddAtributesPerson implements Screen {
    OrthographicCamera guiCam;
    SpriteBatch batcher;
    Rectangle firstPersonCharacter;
    Rectangle secondPersonCharacter;
    Rectangle thirdPersonCharacter;
    Rectangle forthPersonCharacter;
    Rectangle nextBounds;
    Rectangle backBounds;
    Vector3 touchPoint;
    boolean firstPersonCharacterBoolean, secondPersonCharacterBoolean,thirdPersonCharacterBoolean,
    forthPersonCharacterBoolean;
    Game game;


    public AddAtributesPerson(Game game) {
        this.game = game;
    //  Gdx.app.getApplicationListener().setScreen(new Screen());
         Gdx.input.setInputProcessor(null);
    //  Gdx.input.setInputProcessor(new Stage());
        guiCam = new OrthographicCamera(320, 480);
        guiCam.position.set(320 / 2, 480 / 2, 0);
        batcher = new SpriteBatch();


    }


    public void update() {
        if (Gdx.input.isTouched()) {

        guiCam.unproject(touchPoint.set(Gdx.input.getX(), Gdx.input.getY(), 0));

        if (firstPersonCharacter.contains(touchPoint.x, touchPoint.y)) {

                Assets.playSound(Assets.clickSound);

                firstPersonCharacterBoolean=true;
                return;
            }
        if (secondPersonCharacter.contains(touchPoint.x, touchPoint.y)) {
                Assets.playSound(Assets.clickSound);
                secondPersonCharacterBoolean=true;

                return;
            }
        if (thirdPersonCharacter.contains(touchPoint.x, touchPoint.y)) {
                Assets.playSound(Assets.clickSound);
                thirdPersonCharacterBoolean=true;

                return;
            }
        if (forthPersonCharacter.contains(touchPoint.x, touchPoint.y)) {
                Assets.playSound(Assets.clickSound);
                forthPersonCharacterBoolean=true;
                return;
            }


        if (nextBounds.contains(touchPoint.x, touchPoint.y)) {
            Assets.playSound(Assets.clickSound);
            game.setScreen(new GameScreen(game));
            return;
        }

        if (backBounds.contains(touchPoint.x, touchPoint.y)) {
            Assets.playSound(Assets.clickSound);
            game.setScreen(new ChoosePerson(game));
            return;
        }           


    }
    }


    @Override
    public void resume() {

    }

    @Override
    public void dispose() {
    }

    @Override
    public void render(float delta) {
        update();
        draw();
        // TODO Auto-generated method stub

    }

    @Override
    public void resize(int width, int height) {
        // TODO Auto-generated method stub

    }

    @Override
    public void show() {
        // TODO Auto-generated method stub

    }

    @Override
    public void hide() {
        // TODO Auto-generated method stub

    }


    @Override
    public void pause() {
        // TODO Auto-generated method stub

    }   
}