@Alessandra883 I'm sure you double-checked this, but the guest always pays more than what the host receives. Here is an example of what the guest would pay for 2 nights at one of my places:
They would pay $962. But I would receive $750.78 ($594 + $180 less 3% host service fee).
If this doesn't clear things up, definitely do as @Helen3 recommended and contact Airbnb through Twitter by sending a direct message to @airbnbhelp or on their Facebook page.