For some reason more than one point is being added to my scoreboard when I click the add button?

private List<ScoreKeeper> mScoreKeepers;
private ScoreKeeper mScoreKeeper;

public class MyViewHolder extends RecyclerView.ViewHolder {
    public TextView mHoleLabel, mPointLabel;
    public Button mAddButton, mSubButton;


    public MyViewHolder(View itemView) {
        super(itemView);
        mHoleLabel = (TextView) itemView.findViewById(R.id.holeLabel);
        mPointLabel = (TextView) itemView.findViewById(R.id.pointLabel);
        mAddButton = (Button) itemView.findViewById(R.id.addButton);
        mSubButton = (Button) itemView.findViewById(R.id.subButton);
    }


}

public GolfScoreAdapter(List<ScoreKeeper> scoreKeepers){
    mScoreKeepers = scoreKeepers;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

    View itemView = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.hole_score_row, parent, false);
    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
    mScoreKeeper = mScoreKeepers.get(position);
    int number = position + 1;
    String holes = "Hole "+number+":";
    int points = mScoreKeeper.getPoints();
    holder.mHoleLabel.setText(holes);
    holder.mPointLabel.setText(points+"");
    holder.mAddButton.setText("+");
    holder.mSubButton.setText("-");
    holder.mAddButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mScoreKeeper.addPoint();
            holder.mPointLabel.setText(mScoreKeeper.getPoints()+"");
        }
    });
    holder.mSubButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mScoreKeeper.decPoint();
            if(mScoreKeeper.getPoints()<0){mScoreKeeper.setPoints(0);}
            holder.mPointLabel.setText(mScoreKeeper.getPoints()+"");
        }
    });

}

@Override
public int getItemCount() {
    return mScoreKeepers.size();
}

public int getPoints() {
    return mPoints;
}

public ScoreKeeper(){
    mPoints=0;

}

public void addPoint(){
    mPoints++;
}

public void decPoint(){
    mPoints--;
}

public void setPoints(int points) {
    mPoints = points;
}

private static final String PREFS_NAME = "preferences";
private static final String HOLE_NUM = "hole one";
private RecyclerView mRecyclerView;
private GolfScoreAdapter mAdapter;
private List<ScoreKeeper> mScoreKeepers;
private SharedPreferences mSharedPreferences;
private SharedPreferences.Editor mEditor;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    mSharedPreferences = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
    mEditor = mSharedPreferences.edit();
    mScoreKeepers = new ArrayList<ScoreKeeper>();
    getHoles();
    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    mAdapter = new GolfScoreAdapter(mScoreKeepers);
    RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setItemAnimator(new DefaultItemAnimator());
    mRecyclerView.setAdapter(mAdapter);


}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.clear_score) {
        mEditor.clear();
        mEditor.apply();
        for (ScoreKeeper sk : mScoreKeepers) {
            sk.setPoints(0);
        }
        mAdapter.notifyDataSetChanged();
        return true;
    }

    return super.onOptionsItemSelected(item);
}

private void getHoles(){
    ScoreKeeper sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);
    sk = new ScoreKeeper();
    mScoreKeepers.add(sk);

    for(int i =0;i<18;i++){
        mScoreKeepers.get(i).setPoints(mSharedPreferences.getInt(HOLE_NUM+i,0));
    }
}



@Override
protected void onPause() {
    super.onPause();
    for(int i=0;i<18;i++){
    mEditor.putInt(HOLE_NUM+i,mScoreKeepers.get(i).getPoints());
    mEditor.apply();
    }
}