当回滚到顶部并且一些没有显示时，图像从recyclerview消失

Question

我有一个recyclerview来显示图像，问题是当我滚动到顶部时，一些图像消失了。有时它也会错过一些图像......

CARDADAPTER：

public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {

    //Imageloader to load image
    private ImageLoader imageLoader;
    private final Context context;

    //List to store all posts
    List<Posts> Posts;

    //Constructor of this class
    public CardAdapter(List<Posts> Post, Context context){
        super();
        //Getting all
        this.Posts = Post;
        this.context = context;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.posts_list, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {

        //Getting the particular item from the list
        Posts post =  Posts.get(position);

        //Loading image from url
        imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();

        //Showing data on the views
        holder.imageView.setImageUrl(post.getImageUrl(), imageLoader);
        holder.textViewName.setText(post.getName());
        holder.textViewPublisher.setText(post.getPublisher());

    }

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

    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        //Views
        public NetworkImageView imageView;
        public TextView textViewName;
        public TextView textViewPublisher;

        //Initializing Views
        public ViewHolder(View itemView) {
            super(itemView);
            imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
            textViewName = (TextView) itemView.findViewById(R.id.textViewName);
            textViewPublisher = (TextView) itemView.findViewById(R.id.textViewPublisher);
            textViewName.setClickable(true);
            textViewName.setOnClickListener(this);
        }
        @Override
        public void onClick(View v) {
            final Intent intent;
            intent =  new Intent(context, Profile.class);
            intent.putExtra("user", textViewName.getText().toString());
            context.startActivity(intent);
        }

    }
}

为什么我的图片会从recyclerview中消失？我该怎么办？