Hi @Raffaele-and-Astrid0:
Two reasons:
1. There is a (small ;.-) bug in the platform software. This is already notified to AirBnB. But in real life it does not give a problem:
You might see a difference in your listing price and the booking price, because the listing price is not updated in some occasiones even you update the booking price (I wrote a workaround instruction only for the Spanish site...sorry).
2. The listing price always will be a kind of DEFAULT price and the guest needs to quote. The price for booking always is the price IN THE CALENDER, not the listing price (even AirBnB is notifying that to every portential guest).
Imagine you specified special price for weekends or holidays.... how should the listing price change? You will not know, what dates the guest will request.
So e.g. the listing price of 100USD will change to 120USD when the quest wants to stay weekends, but the listing price cannot show that.
Same for "Intelligent pricing": If the intelligent price rises or lowers for the time the guest wants to book, that cant be shown in the listing price.
Regards
Michael
Saludos
Michael