[Flutter] Url path not changing when navigating back to previous page in flutter web

I am working on a flutter app. i have set up router in the app with named routes. on going to my home page it shows as locahost:1234/#/home. and the path is correct. but from there when a navigate back to previouse page it still showing the same path locahost:1234/#/home. the path url is not changing on navigating back. if any one has an idea? my router file is as follows:

/* ADD REPOSITORY TO APP ROUTER */
/* ADD REPOSITORY TO APP ROUTER */
Repository repository;
AppRouter() {
repository = new Repository(apiService: ApiService());
}

Route generateRoute(RouteSettings settings) {
switch (settings.name) {
case "/":
return MaterialPageRoute(
settings: RouteSettings(name: '/'),
builder: (_) => MultiBlocProvider(providers: [
BlocProvider<HomeCubit>(
create: (BuildContext context) {
return HomeCubit(repository: repository);
},
),
BlocProvider<SearchCubit>(
create: (BuildContext context) =>
SearchCubit(repository: repository),
),
BlocProvider<UserCubit>(
create: (BuildContext context) {
return UserCubit(repository: repository);
},
)
], child:userToken==null?SplashScreen():NavScreen()
// SplashScreen()
));
case "/getstarted":
return MaterialPageRoute(
settings: RouteSettings(name: '/getstarted'),
builder: (_) => BlocProvider(
create: (BuildContext context) =>
ProfileCubit(repository: repository),
child: OnboardingScreen()));
//return MaterialPageRoute(builder: (_) => VideoDetailScreen());
case "/register":
return MaterialPageRoute(
settings: RouteSettings(name: '/register'),
builder: (_) => MultiBlocProvider(providers: [
BlocProvider<HomeCubit>(
create: (BuildContext context) {
return HomeCubit(repository: repository);
},
),
BlocProvider<SearchCubit>(
create: (BuildContext context) =>
SearchCubit(repository: repository),
),
BlocProvider<UserCubit>(
create: (BuildContext context) =>
UserCubit(repository: repository),
)
], child: RegisterScreen()));
case '/home':
return MaterialPageRoute(
settings: RouteSettings(name: '/home'),
builder: (_) => BlocProvider(
create: (BuildContext context) =>
HomeCubit(repository: repository),
child: NavScreen()));
case '/signin':
return MaterialPageRoute(
builder: (_) => BlocProvider(
create: (BuildContext context) =>
UserCubit(repository: repository),
child: SigninScreen()),
settings: RouteSettings(name: '/signin'));
default:
return MaterialPageRoute(builder: (_) {
return Scaffold(
body: Center(
child: Text('Error! No route Found...',
style: TextStyle(color: Colors.white,fontWeight:FontWeight.bold),),
),
);
}
);
}
}
}

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