RecyclerView only lists first item despite layout changes

Question

I understand this might be a duplicate, but every other solution here didn't work in my case, such as changing the layout_height to wrap_content instead of match_parent.

My Firestore database has 2 values stored inside an array, and I want to display both of them (more in the future) in my RecyclerView, however, it only displays the first value, at position 0.

Here is my Activity where the Recycler and the Adapter are created:

ActivityOs

 private FirestoreAdapter listAdapter;
    private FirebaseFirestore db = FirebaseFirestore.getInstance();
    private CollectionReference osRef = db.collection("cliente");
    private DocumentReference docRef = osRef.document("clienteTeste");

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_os);

        RecyclerView recyclerView = findViewById(R.id.recyclerViewOs);

        /*docRef.get().addOnCompleteListener(task -> {
            if (task.isSuccessful()) {
                DocumentSnapshot document = task.getResult();
                if (document.exists()) {
                    Log.e("RESULTADO","result:" + document.toString());
                }
            }
        });*/

        Query query = osRef.orderBy("serviceOrder",
                Query.Direction.ASCENDING);

        FirestoreRecyclerOptions options =
                new FirestoreRecyclerOptions.Builder()
                        .setQuery(osRef, ServiceDocument.class)
                        .build();

         listAdapter = new FirestoreAdapter(options);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(listAdapter);
        listAdapter.notifyDataSetChanged();

    }

    @Override
    protected void onStart() {
        super.onStart();
        listAdapter.startListening();
    }

    @Override
    protected void onStop() {
        super.onStop();
        listAdapter.stopListening();
    }

The commented code shows me that the database does indeed return the 2 values stored in it.

Here is my `Adapter` class:


public class FirestoreAdapter extends FirestoreRecyclerAdapter {

    public FirestoreAdapter(@NonNull FirestoreRecyclerOptions options) {
        super(options);
    }

    @Override
    protected void onBindViewHolder(@NonNull ViewHolder holder, int position, @NonNull ServiceDocument model) {
        holder.osIdItem.setText(String.valueOf(model.serviceOrderArray.get(position).getId()));
        holder.osClientItem.setText(model.serviceOrderArray.get(position).getClient().getName());
        holder.osDateItem.setText(model.serviceOrderArray.get(position).getDate());
        holder.osValueItem.setText(String.valueOf(model.serviceOrderArray.get(position).getTotalValue()));
    }

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

        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());

        View view = layoutInflater.inflate(R.layout.layout_os_item, parent, false);

        return new FirestoreAdapter.ViewHolder(view);
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        private  TextView osIdItem;
        private  TextView osClientItem;
        private  TextView osDateItem;
        private  TextView osValueItem;

        public ViewHolder(View itemView) {
            super(itemView);

            osIdItem =  itemView.findViewById(R.id.osIDItem);
            osClientItem =   itemView.findViewById(R.id.osClientNameItem);
            osDateItem =  itemView.findViewById(R.id.osDateItem);
            osValueItem =  itemView.findViewById(R.id.osValueItem);
        }
    }
}

And here are my layouts, activity_os.xml where my RecyclerView is created, and layout_os_item.xml where the layouts for each item of the recycler are made.

Activity_os.xml

Layout_os_item.xml

Any help is welcome!

Edit

Current Result:

Expected Result

Basically, Item 0 or the first item is correct, however, the second item in my database should also appear in Item 1.