Android Bug BaseExpandableListAdapter, getChildView

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        @Override        public View getChildView(final int groupPosition, final int childPosition,                boolean isLastChild, View convertView, ViewGroup parent) {            Log.d(TAG, "getChildView() group="+groupPosition+", child="+childPosition);            final String children = (String) getChild(groupPosition,childPosition);            if (convertView == null || children != ((ViewHolder) convertView.getTag()).text.getText()) {                Log.d(TAG, "getChildView() - initialize converView");                LayoutInflater inflater = LayoutInflater.from(context);                 convertView = inflater.inflate(R.layout.expandable_list_row, null);                ViewHolder viewHolder = new ViewHolder();                viewHolder.text = (TextView) convertView.findViewById(R.id.textView1);                viewHolder.image = (ImageView) convertView.findViewById(R.id.imageCheck);                convertView.setTag(viewHolder);                            convertView.setOnClickListener(new View.OnClickListener() {                    @Override                    public void onClick(View v) {                        Log.e("test","group="+groupPosition+", child="+childPosition);                        final ImageView imageCheck = (ImageView)v.findViewById(R.id.imageCheck);                        imageCheck.setVisibility(ImageView.VISIBLE);                        int dialogType = getAntecedentType(groupPosition, childPosition);                        int antecedentId = getAntecedentId(groupPosition, childPosition);                        if(antecedentId != -1) {                            MedicalAntecedentDialog dialog = dialogs.get(antecedentId);                            if(dialog != null) {                                dialog.show();                            }                            else {                                MedicalAntecedentDialog dialog2 = new MedicalAntecedentDialog(context, children, dialogType);                                dialogs.append(antecedentId, dialog2);                                dialog2.show();                            }                        }                    }                });            }            ViewHolder holder = (ViewHolder) convertView.getTag();            holder.text.setText(children);            return convertView;        }

這裡出現問題：
if (convertView == null || children != ((ViewHolder) convertView.getTag()).text.getText()) {                Log.d(TAG, "getChildView() - initialize converView");

Group1裡前9項都被初始化了，而第十個和第十一個沒有，第十二個元素初始化正確。不知道為什麼。。。