List shows loading and empty widget's at the same time

[AAllport]

Given the following code:

return Scaffold(
  drawer: AppDrawer(activeRoute: activeRoute),
  appBar: AppBar(title: title),
  body: CustomListView(
    empty: Text("Empty"),
    pageSize: 12,
    loadingBuilder: (BuildContext context) => Center(child: CircularProgressIndicator()),
    adapter: ListAdapter(fetchItems: (int offset, int limit) async {
      var items = await fetchItems(offset,limit);
      return ListItems(items.data, reachedToEnd: items.to == items.total);
    }),
    itemBuilder: (BuildContext context, int idx, dynamic item) => MyListItem(item),
  ),
);

Both the word "empty" and the CircularProgressIndicator are visible to the user.
Please, correct me if I'm wrong, but this doesn't seem like the intended behaviour?

[AAllport]

Nice one!