Flutter's ListView.builder don't render anything

I’m making an routine app but I’m having problems to render a list of cards in my app Flutter. The function that calls the api returns an json, ok, but my code appears to don’t work with it.

my api returns:

[{id: 1, belongs_to: 2, title: have breakfast, description_text: make my breakfast, date_time: 2023-09-16 15:46:25}]

my code

class RoutineScreen extends StatefulWidget {
  const RoutineScreen({Key? key}) : super(key: key);

  @override
  State<RoutineScreen> createState() => _RoutineScreenState();
}

class _RoutineScreenState extends State<RoutineScreen> {

  Future<List<Map<String, dynamic>>> getRoutines() async {
    var headers = {
      'Content-Type': 'application/x-www-form-urlencoded'
    };

    var request = http.Request('POST', Uri.parse('http://localhost:8080'));

    request.bodyFields = {
      'route': 'routine_get',
      'id':'2'
    };

    request.headers.addAll(headers);

    http.StreamedResponse response = await request.send();

    if (response.statusCode == 200) {
      String responseBody = await response.stream.bytesToString();
      List<dynamic> jsonData = json.decode(responseBody);
      return jsonData.cast<Map<String, dynamic>>();
    } else {
      throw Exception('Erro na requisição. Código de status: ${response.statusCode}');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FractionallySizedBox(
        widthFactor: 1.0,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            SizedBox(height: 15.0,),
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 10.0),
              child: Text(
                  'Olá!',
                  style: TextStyle(
                    color: primaryColor,
                    fontSize: 30.0
                  ),
              ),
            ),
            Padding(
              padding: EdgeInsets.symmetric(horizontal: 10.0),
              child: Text(
                'Sua rotina de hoje:',
                style: TextStyle(
                    fontSize: 20.0
                ),
              ),
            ),
            SizedBox(height: 20.0),
            FutureBuilder<List<Map<String, dynamic>>>(
              future: getRoutines(),
              builder: (context, snapshot) {
                if (snapshot.connectionState == ConnectionState.waiting) {
                  return Center(
                    child: CircularProgressIndicator(),
                  );
                } else if (snapshot.hasError) {
                  return Center(
                    child: Text('Erro: ${snapshot.error}'),
                  );
                } else if (snapshot.hasData) {
                  List<Map<String, dynamic>> data = snapshot.data!;
                  return ListView.builder(
                    itemCount: data.length,
                    itemBuilder: (context, index) {
                      print('entrou no builder');
                      String title = data[index]['title'];
                      String text = data[index]['description_text'];
                      int id = data[index]['id'];
                      return CardRoutine(id: id, title: title, postText: text);
                    },
                  );
                } else {
                  return Center(
                    child: Text('Nenhum dado encontrado.'),
                  );
                }
              },
            ),
          ],
        ),
      ),
    );
  }
}

what can be happening here?

I tryed to debug, my code returns my necessary data, but dont enters in ListView.builder