Ceste rezervacije i otkazi

 in the last month I get reservations for apartments Pinevile 13 Zlatibor and apartments Pinevile 4 Zlatibor on the site from other countries of cancellation within 24 hours.
I understand that it can happen that sometimes the card is not valid but in the last 5 bookings there is a problem. All bookings that are scheduled and canceled within 24 hours
Can you explain to me what the problem is?