Позиции не по порядку Custom BaseExpandableListAdapter

Пытаюсь сделать расширенный список на основе ExpandableListView, соответственно использую кастом адаптер. Но по какой то причине, после запуска, когда я начинаю крутить список вверх, вниз, список отображается не по порядку, т.е. первый в alGroups.address отображаемый = например "ELDORADO", второй = "LENTA", и так далее, но после прокрутки, первый и второй могут отображаться на какой угодно позиции. Где я ошибся в коде?

public class SmsItemInfo {

    public final int id;
    public final String date;
    public final String address;
    public final String body;
    public final String guid;
    public final boolean uploaded;

    public SmsItemInfo(int id, String date, String address, String body, String guid, boolean uploaded) {
        this.id = id;
        this.date = date;
        this.address = address;
        this.body = body;
        this.guid = guid;
        this.uploaded = uploaded;
    }


package com.dkmm.smsparser.adapters;

    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseExpandableListAdapter;
    import android.widget.CheckBox;
    import android.widget.TextView;

    import com.dkmm.R;
    import com.dkmm.constants.SmsItemInfo;

    import java.util.ArrayList;

    public class AdapterSmsListEx extends BaseExpandableListAdapter {

        private ArrayList<SmsItemInfo> alGroups;
        private ArrayList<ArrayList<SmsItemInfo>> alChildrens;
        private Context context;
        private LayoutInflater inflater;

        public static class TagSmsItem {
            public int id;
            public String date;
            public String address;
            public String body;
            public String guid;
            public boolean uploaded;
            public CheckBox chkUploaded;
            public TextView tvAddress;
            public TextView tvBody;
        }

        public AdapterSmsListEx(Context context, ArrayList<SmsItemInfo> alGroups, ArrayList<ArrayList<SmsItemInfo>> alChildrens) {
            this.context = context;
            this.alGroups = alGroups;
            this.alChildrens = alChildrens;
            this.inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }

        @Override
        public int getGroupCount() {
            return alGroups.size();
        }

        @Override
        public int getChildrenCount(int groupPos) {
            return alChildrens.get(groupPos).size();
        }

        @Override
        public Object getGroup(int groupPos) {
            return alGroups.get(groupPos);
        }

        @Override
        public Object getChild(int groupPos, int childPos) {
            return alChildrens.get(groupPos).get(childPos);
        }

        @Override
        public long getGroupId(int groupPos) {
            return groupPos;
        }

        @Override
        public long getChildId(int groupPos, int childPos) {
            return childPos;
        }

        @Override
        public boolean hasStableIds() {
            return false;
        }

        @Override
        public View getGroupView(int groupPos, boolean b, View convertedView, ViewGroup parent) {

            TagSmsItem tagSmsItem;

            try {

                tagSmsItem = new TagSmsItem();
                SmsItemInfo smsItemInfo = alGroups.get(groupPos);

                if (convertedView == null) {
                    convertedView = inflater.inflate(R.layout.view_sms_address_list, null);

                    tagSmsItem.id = smsItemInfo.id;
                    tagSmsItem.date = smsItemInfo.date;
                    tagSmsItem.address = smsItemInfo.address;
                    tagSmsItem.body = smsItemInfo.body;
                    tagSmsItem.guid = smsItemInfo.guid;
                    tagSmsItem.uploaded = smsItemInfo.uploaded;
                    tagSmsItem.tvAddress = (TextView) convertedView.findViewById(R.id.tvSmsAddress);

                    tagSmsItem.chkUploaded.setChecked(tagSmsItem.uploaded);
                    convertedView.setTag(tagSmsItem);
                } else {
                    tagSmsItem = (TagSmsItem) convertedView.getTag();
                }

                tagSmsItem.chkUploaded = (CheckBox) convertedView.findViewById(R.id.chkUploadAddress);
                tagSmsItem.tvAddress.setText(tagSmsItem.address + " - " + Integer.toString(groupPos));

                // раскрываем группу
                //ExpandableListView mExpandableListView = (ExpandableListView) parent;
                //mExpandableListView.expandGroup(groupPos);
            } catch (Exception e) {

            return null;
            }
             return convertedView;
        }

        @Override
        public View getChildView(int groupPos, int childPos, boolean isLastChild, View convertedView, ViewGroup parent) {

            TagSmsItem tagSmsItem;

            try {

                tagSmsItem = new TagSmsItem();
                SmsItemInfo smsItemInfo = alChildrens.get(groupPos).get(childPos);

                if (convertedView == null) {
                    convertedView = inflater.inflate(R.layout.view_sms_list_item, null);

                    tagSmsItem.id = smsItemInfo.id;
                    tagSmsItem.date = smsItemInfo.date;
                    tagSmsItem.address = smsItemInfo.address;
                    tagSmsItem.body = smsItemInfo.body;
                    tagSmsItem.guid = smsItemInfo.guid;
                    tagSmsItem.uploaded = smsItemInfo.uploaded;
                    tagSmsItem.tvAddress = (TextView) convertedView.findViewById(R.id.tvSmsAddress);
                    tagSmsItem.tvBody = (TextView) convertedView.findViewById(R.id.tvSmsBody);
                    tagSmsItem.chkUploaded = (CheckBox) convertedView.findViewById(R.id.chkUploadSms);
                    convertedView.setTag(tagSmsItem);
                } else {
                    tagSmsItem = (TagSmsItem) convertedView.getTag();
                }

                tagSmsItem.tvAddress.setText(smsItemInfo.address);
                tagSmsItem.tvBody.setText(smsItemInfo.body);
                tagSmsItem.chkUploaded.setChecked(smsItemInfo.uploaded);

            } catch (Exception e) {

                return null;
            }
            return convertedView;
        }

        @Override
        public boolean isChildSelectable(int i, int i1) {
            return true;
        }

    }