When scrolling in a RecyclerView the elements change position

I have a recyclerview in which I have some items, when I click on any of them, an imageview appears on the selected item, this part I already manage to do but my problem is that when I scroll down and go back up element that became visible is duplicated in other items that I have not selected. How could I solve this situation? Thank you in advance.

When I select the item.

is duplicated in another item.

Adapter code:

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

    private List<Employee> mEmployees = new ArrayList<>();
    private ClickItem clickItemAc;
    private View viewGeneral;

    public EmployeeRecyclerViewAdapter(List<Employee> employeeList,ClickItem clickItem) {
        this.mEmployees.addAll(employeeList);
        this.clickItemAc = clickItem;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        final View view = inflater.inflate(R.layout.list_item, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        final Employee employee = mEmployees.get(position);
        holder.name.setText(employee.getName());
        holder.role.setText(employee.getRole());
    }

    public void updateEmployeeListItems(List<Employee> employees) {
        final EmployeeDiffCallback diffCallback = new EmployeeDiffCallback(this.mEmployees, employees);
        final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);

        this.mEmployees.clear();
        this.mEmployees.addAll(employees);
        diffResult.dispatchUpdatesTo(this);
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder implements ClickItem {

        private final TextView role;
        private final TextView name;
        private final ImageView status;

        public ViewHolder(View itemView) {
            super(itemView);
            viewGeneral = itemView;
            name = (TextView) itemView.findViewById(R.id.employee_name);
            role = (TextView) itemView.findViewById(R.id.employee_role);
            status = (ImageView) itemView.findViewById(R.id.status);

            name.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    clickItemAc.clickItem(viewGeneral);
                }
            });
        }

        @Override
        public void clickItem(View v) {

        }
    }
}