data in hive boxes are deleted after a hot restart or close the app

**Steps to Reproduce**

the problem is that Hive acting unexpectedly , and when the app closes or i restart it all the data in the box are cleared .

I don't know if I am doing something wrong but I followed the docs as they say :

1- registered the adapter

2- opened the box

3- called it in a widget

**Code sample**

**main.dart :**
```

void main() async {
WidgetsFlutterBinding.ensureInitialized();
SystemChrome.setSystemUIOverlayStyle(
const SystemUiOverlayStyle(statusBarColor: Colors.transparent));
await Firebase.initializeApp();
await Hive.initFlutter();
Hive.registerAdapter(CredentialsModelAdapter());
Hive.registerAdapter(DoctorModelAdapter());
Hive.registerAdapter(DuserModelAdapter());
Hive.registerAdapter(DoctorAppointmentsAdapter());
Hive.registerAdapter(AppointmentStatusesAdapter());
Hive.registerAdapter(AccountTypeAdapter());
Hive.registerAdapter(UserAdapter());

await Hive.openBox("cred");
await Hive.openBox("doctor");
runApp(ProviderScope(child: MyApp()));
}

class MyApp extends StatelessWidget {
MyApp({Key? key}) : super(key: key);
final _appRouter = app_router.AppRouter();
@override
Widget build(BuildContext context) {
return MaterialApp.router(
title: "x",
debugShowCheckedModeBanner: false,
routerDelegate: _appRouter.delegate(),
routeInformationParser: _appRouter.defaultRouteParser(),
);
}
}
```

**here is where I fetch the data from the api and store it in box :**

```
@override
Future> signInWithEmailAndPassword(
{required String email, required String password}) async {
late Box credentials;
var result;
try {
final response = await http.get(Uri.parse(
"xxxxxxxx"));
if (response.statusCode == 200) {
result = await json.decode(response.body);

if (result["AZSVR"] == "FAILED") {
return const Left(ApiFailures.authFailed());
} else {
var content = CredentialsModel.fromJson(result);
credentials = Hive.box("cred");
credentials.put('cred', content);
return right(result["api_token"]);
}
}
} on SocketException catch (e) {
return const Left(ApiFailures.noConnection());
} on HttpException {
return const Left(ApiFailures.notfound());
} catch (_) {
return const Left(ApiFailures.notfound());
}
return Right(result["api_token"]);
}
```

**where i call the box :**
```
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:vwelfare/application/provider/doctor.repository.provider.dart';
import 'package:vwelfare/domain/models/doctor/duser.dart';
import '../../domain/models/credentials/credentials.dart';

class MyWidget extends HookConsumerWidget {
const MyWidget({super.key});

@override
Widget build(BuildContext context, WidgetRef ref) {
final Box credBox = Hive.box("cred");
final Box doctorBox = Hive.box("doctor");
final controller = useTextEditingController();
final uid = useState(0);
final cred = useState(const CredentialsModel());
return Scaffold(
body: ValueListenableBuilder(
valueListenable: credBox.listenable(),
builder: (context, Box box, _) {
final cred = box.get("cred");
print(cred!.api_token);
final doctor = ref.watch(getDoctor(cred.api_token!));
return doctor.when(
data: (data) => data.fold(
(l) => ValueListenableBuilder(
valueListenable: doctorBox.listenable(),
builder: (context, Box box, _) {
final model = box.get("doctor");
final doctor = model!.User;

if (doctor != null) {
return Center(
child: Text("${doctor.address}"),
);
} else {
return const Center(
child: Text("CONTACT US"),
);
}
}),
(r) => Center(child: Text("${r.User!.name}"))),
loading: () => const CircularProgressIndicator(),
error: (error, stackTrace) {
print(error);
return Center(
child: Text("$error hello"),
);
});
},
),
);
}
}

```

**Version**
- Platform: iOS, Android
- Flutter version: [latest]
- Hive version: [latest]