The dates displayed as "orphans" are those nights that cannot be booked due to some booking restrictions that force a minimum length of stay greater than 1 night. Such orphan dates can be calculated in two ways: by only checking the bookings for the dates ahead (in the future), or by also considering the free nights before a specific date. Choose your preferred calculation method to see warning messages about the various orphan dates found, in case you would like to reduce or remove the restrictions for the minimum stay.