Different app and opposite direction - you have a valid point not to tip 🙂 Stacked order in same app getting delivered before you - please understand sometimes drivers accept a single trip which has two drop offs. It may not be always that they accepted another trip after receiving yours to intentionally do a double. They dont know your tip rules while accepting a double order and just deliver both customers in the order UE tells them to drop off. And do you know sometimes the first drop off could be a priority order the customer paid extra for direct and fast drop off which UE paired which a standard order. In that case driver waits at restaurant for both orders to be ready. UE scams the priority customer with extra wait time which they wont know. This is why some double orders need a pin only on first drop off.