Christopher Luc

are you calling the appropriate notify function (i.e. notifyItemRangeInserted) in your RecyclerView.Adapter?

When data is added to your data set, you're calling notifyItemRemoved(position) inside your recyclerview's adapter, yeah?

Your adapter should always call notifyItemInserted (or others). That is independent of these animators. You would still need to do that even for DefaultItemAnimator.