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flutter - Firebase always reads from internet

As I know Firebase on Flutter will automatically read from cache first but I noticed while development that an app just play around with almost 1 stream that has 10 or 15 document I have reach reads above 4000 reads! By this way if 10 users has used my app I will pay all I have, so I have recheck every query, snapshot and put this code to know

print(itemDoc.metadata.isFromCache ? "itemDoc NOT FROM NETWORK" : "itemDoc FROM NETWORK");

Edit write the code and more explain

I noticed this issue appear in IOS when I update,add,delete a document console print all stored documents.

I have Main Stream that I get all users lists then every list I create stream for it to listen list's items

userListsStream(uid){
    Stream<QuerySnapshot> shoppingListsStream = 
    Firestore.instance.collection('lists').where('owner', arrayContains: uid).snapshots();

    shoppingListsStream.listen(
        (QuerySnapshot listsQuery) async {

          List<DocumentSnapshot> listsDocs = listsQuery.documents;
          if (listsDocs.length != 0) {
            //? foreach on lists Documents
            listsDocs.forEach(
              (DocumentSnapshot listDoc) async {
              print(listDoc.metadata.isFromCache ? "listDoc NOT FROM 
              NETWORK" : "listDoc FROM NETWORK");
              listItemsStream(listDoc.documentID);
         }
        )
       }
    })
}

listItemsStream(lid){
shoppingItemsRef =  Firestore.instance.collection('lists').document(lid).collection('items');

shoppingItemsRef.snapshots().listen(
        (QuerySnapshot itemsQuery) async {
          List<DocumentSnapshot> itemsDocs = itemsQuery.documents;
          if (itemsDocs.length != 0) {
            itemsDocs.forEach(
              (DocumentSnapshot itemDoc) async {
              print(itemDoc.metadata.isFromCache ? "itemDoc NOT FROM 
              NETWORK" : "itemDoc FROM NETWORK");
             }
           )
          }
}

those two methods in Provider that I call the main function in Home.dart initState

 @override
  void initState() {
    Provider.of<ListsProvider>(context, listen: false)
        .userListsStream(uid);
  }
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