The business you deliver for sets how a delivery prices, whether by time, by stops, or by its own rate. That's why two similar-looking deliveries can pay differently.
Some deliveries add extras on top: tolls when the route has them and reviewed wait time past the loading window. These show up on the delivery in Menu → Activity & Payouts.
Tips are separate. They go straight to your Venmo, never through Metrobi, and only reach you once you've added your Venmo link.
Once you take a delivery, its pay doesn't fall below what the offer showed you, and a shipper can raise it after that. A closed incident or a cancellation can bring it down instead, the delivery shows the reason either way.
If the amount doesn't add up, open the delivery in Activity & Payouts and bring it to support.