Hello Kerri,
For a guest the accommodation amount does not just include your nightly rate with your discount applied - it also includes the cleaning fee you charge and the Airbnb commission (service fee) which is much higher for guests than the one you are charged.
In the reservation section you should be able to see what you will earn minus commission but also what the guest will end up paying with all fees included. Another way of seeing this is by using the "preview mode" on your listing which allows you to see your listing as if you were a guest and you will see the breakdown clearly.
All the best
Joëlle