Gridview.build for Firestore pagination get Rebuilded Every time the list of items change

Question

i'm using Gridview.build for Firestore pagination , when the user scroll down to the last of the gridview , i get more data to the List of items , and notifyListeners() ( i'm using provider) the problem here that when the ListOfItems.lenght changes , all the items of the Gridview.builder rebuilded ,

here is the code

  GridView.builder(
  itemCount: Provider.of<Myprovider>(context).ProductList.length,
  itemBuilder: (context,index){
  QueryDocumentSnapshot tmp=  Provider.of<Myprovider>(context,listen: 
false).ProductList[index];
 return ItemProduct(tmp: tmp,index:index);
 },
 ),

Thanks