Why is ChangeNotifier updating endlessly - flutter

Question

I have 2 data provider classes that extend ChangeNotifier. Within each, there's a function to fetch data and at the end of them, I use notifyListeners() to notify the screens/listeners that the data changed. However, it seems that the listeners start getting notified endlessly instead of once and that creates a loop of reloading, circle indicators that don't go away, and a frozen screen. I don't get it.
Data providers:
class UsersDataProvider extends ChangeNotifier {
UsersDataProvider() : super();
static Map<int, QueryDocumentSnapshot<Object?>> usersMap = {};
Future<void> fetchUsers() async {
final userRef = FirebaseFirestore.instance.collection('users');
final QuerySnapshot result = await userRef.get();
final docs = result.docs.asMap();
usersMap = docs;
print(usersMap.length);
notifyListeners();
}
}
class PostsDataProvider extends ChangeNotifier {
PostsDataProvider() : super();
static Map<int, QueryDocumentSnapshot<Object?>> postsMap = {};
Future<void> fetchPosts() async {
UsersDataProvider.usersMap.forEach((index, resultValue) async {
final postsRef = FirebaseFirestore.instance
.collection('users')
.doc(resultValue.id)
.collection('posts');
final QuerySnapshot postsResult = await postsRef.get();
final postDocs = postsResult.docs.asMap();
postsMap = postDocs;
print('Post map: ${postsMap.length}');
notifyListeners();
});
}
}
Add listeners and reload data:
Future<void> fetchUsersAndPosts(bool initial) async {
if (!initial) {
setState(() {
postsLoading = true;
});
usersDataProvider.fetchUsers();
postsDataProvider.fetchPosts();
}
if (initial) {
usersDataProvider.addListener(() {
print('changed');
setState(() {
fetchUsersAndPosts(false);
});
});
}
if (initial) {
postsDataProvider.addListener(() {
setState(() {
fetchUsersAndPosts(false);
});
});
}
UsersDataProvider.usersMap.forEach((index, value) async {
List<Post> posts = [];
PostsDataProvider.postsMap.forEach((index, value) {
final post = Post.fromJson(value.data() as Map<String, dynamic>);
posts.add(post);
setState(() {});
if (posts.length == PostsDataProvider.postsMap.length) {
setState(() {
postsList = posts;
postsList.sort((a, b) {
return b.date.compareTo(a.date);
});
postsLoading = false;
});
}
});
final profileInfo =
ProfileInfoObject.fromJson(value.data() as Map<String, dynamic>);
Profile profile = Profile(profileInfo, postsList.where((p) => p.uid == value.id).toList());
UserSearchResult user = (UserSearchResult(profile, value.id));
if (usersList.where((u) => u.uid == user.uid).toList().isEmpty) {
setState(() {
usersList.add(user);
});
}
});
setState(() {
postsList.sort((a, b) {
return b.date.compareTo(a.date);
});
});
}