Android - Views remain in the background of RecyclerView

I have an application that is basically a video player, in the gallery it happens that when I change the orientation of the screen or return of the player to the fragment the bottom of the RecyclerView gets "polluted":

Asyoucansee,it'sasiftheviewsgetstuckinthebackground

Album:

publicclassAlbumGalleryextendsFragmentimplementsGalleryListener{publicstaticfinalStringTAG="ALBUM_GALLERY_FRAGMENT";

    private static HashMap<String, GalleryItem> mFolders;

    private RecyclerView rvAlbumGallery;
    private AlbumGalleryAdapter mAdapter;

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        if(mFolders == null){
            mFolders = new HashMap<>();
        }

        listFolders();

        rvAlbumGallery.setHasFixedSize(true);
        rvAlbumGallery.setLayoutManager(new GridLayoutManager(getActivity(), 2));
        rvAlbumGallery.setAdapter(new AlbumGalleryAdapter(getActivity(), this, mFolders));

    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        super.onCreateView(inflater, container, savedInstanceState);
        View layout = inflater.inflate(R.layout.fragment_album_gallery, container, false);

        rvAlbumGallery = (RecyclerView) layout.findViewById(R.id.rvAlbumGallery);

        return layout;
    }

   ...
}

Adapter :

public class AlbumGalleryAdapter extends RecyclerView.Adapter<AlbumGalleryAdapter.GalleryHolder> {

    private FragmentActivity mActivity;
    private GalleryListener mListener;
    private ArrayList<GalleryItem> mItems;

    private static int listThumbSize = 0;

    public AlbumGalleryAdapter(@NonNull FragmentActivity activity, @NonNull GalleryListener listener, @NonNull HashMap<String, GalleryItem> items){
        this.mActivity = activity;
        this.mListener = listener;
        this.mItems = new ArrayList<>(items.values());

        if(listThumbSize == 0)
            listThumbSize = (int)(activity.getResources().getDimension(R.dimen.rowVideoThumbnailSize) / activity.getResources().getDisplayMetrics().density);
    }

    @NonNull
    @Override
    public GalleryHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        return new GalleryHolder(inflater.inflate(R.layout.album_gallery_item, parent, false));
    }

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

        GalleryItem item = mItems.get(position);
        holder.listener = mListener;

        DisplayMetrics dm = new DisplayMetrics();
        mActivity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        holder.thumbnail.getLayoutParams().height = dm.heightPixels / 4;

        if (item.isFolder) {

            holder.isFolder = true;
            holder.name.setText(item.getFolderName());

            for (int i = 0; i < mItems.size(); i++) {

                if (mItems.get(i).containsFolder(item.getFolderName())) {
                    RequestOptions options = new RequestOptions().override(holder.thumbnail.getWidth(), dm.heightPixels / 4).centerCrop();
                    Glide.with(mActivity).load(mItems.get(i).getFile()).apply(options).into(holder.thumbnail);
                    break;
                }

            }

        } else {
            RequestOptions options = new RequestOptions().override(holder.thumbnail.getWidth(), dm.heightPixels / 3).centerCrop();
            Glide.with(mActivity).load(item.getFile()).apply(options).into(holder.thumbnail);
            holder.name.setText(item.getName());
        }

    }

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

    public void clean(){
        final int size = mItems.size();
        mItems.clear();
        notifyItemRangeRemoved(0, size);
        notifyDataSetChanged();
    }

    public void addItem(GalleryItem item, int pos){

    }

    static class GalleryHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

        boolean isFolder = false;
        TextView name;
        ImageView thumbnail;
        GalleryListener listener;

        GalleryHolder(@NonNull View v) {
            super(v);

            name = (TextView)v.findViewById(R.id.item_gallery_movies_Name);
            thumbnail = (ImageView)v.findViewById(R.id.item_gallery_movies_Thumb);
            final ImageButton btnPopup = (ImageButton)v.findViewById(R.id.rowBtnPopup);
            btnPopup.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onItemContextClick(btnPopup, getAdapterPosition());
                }
            });

            v.setOnClickListener(this);
        }

        @Override
        public void onClick(View v) {
            listener.onItemClick(getAdapterPosition(), isFolder);
        }
    }

}

Representation to item :

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:elevation="@dimen/card_elevation"
    app:cardUseCompatPadding="false"
    app:cardPreventCornerOverlap="true"
    app:cardCornerRadius="@dimen/card_corner_radius"
    android:layout_margin="4dp">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <ImageView
        android:layout_margin="8dp"
        android:id="@+id/item_gallery_movies_Thumb"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="centerCrop"/>

        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        <TextView
            android:id="@+id/item_gallery_movies_Name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_weight="1"
            android:maxLines="1"
            android:textSize="14sp"
            android:padding="4dp"
            android:layout_marginTop="4dp"
            android:layout_marginBottom="4dp" />

        <ImageButton
            android:id="@+id/rowBtnPopup"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:background="@android:color/transparent"
            app:srcCompat="@drawable/more_vert_btn"
            android:layout_weight="0"/>

        </LinearLayout>

    </LinearLayout>

</androidx.cardview.widget.CardView>

Gallery layout :

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rvAlbumGallery"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>