Hi, @Calin3. You have "Each room can accommodate 2 guests. Please keep it into account when making reservations".
But that is not the way Airbnb works. So the poor guests don't know what to do.
They see that it is $33 per night, and that they get 8 bedrooms and can have up to 10 people in their party. "Extra people: No Charge," it says, right on your listing. Deal of the century.
You, as host, have two options. The easiest is just to add an extra charge per guest after 2 guests. You do this through Manage Listings -> Pricing -> Extra charges -> Extra guests.
OR you can set up a separate listing for each room.
These are the only ways you and your guests will be able to work this out.