Extending long term stay

[Emiel1]

Today i noticed a glitch (at least i consider it as not being a logical calculation) while changing a long term reservation.

A long term reservation useally has a monthly discount on it.

So on request of a guest I wanted to extended such a reservation with 12 nights.

So i used the "change reservation" feature.

But extended price did NOT calculate according monthly discount, but took weekly discount.

But at same time i noticed it calculated the Airbnb Guest service fee based on long term stay (Appr. 11%, same as original reservation)

To me this is not logic. What is your opinion ?

(BTW to solve this: I calculated the right price myself,  based on monthly discount,  and put it in manually).