Yes that’s perfectly normal. Neutering can lessen it but plenty of neutered rabbits will continue to do some poops outside the litter tray. It’s territorial marking. Generally a bunny is still considered litter trained if they wee and do most of their poops inside the tray, it is normal for them to not be 100% reliable. Only 1 of the 6 bunnies I have had were 100% reliable with getting all poops in the tray.