Hello @Uli9,
That is the way booking with Airbnb works for reservations of less than 28 days.
When the guest sends a reservation request and the host accepts it, Airbnb charges their credit in full immediately.
So when the host sees a confirmed reservation they know that the guest has paid Airbnb in full.
Then, the day after the guest checks in, Airbnb starts the process to pay the host. It may take a few days for the money to reach the host's account.
When do I get charged for a reservation?
When do I get paid?
Steve.