In aiims why all seats have not been allotted?

In aiims why all seats have not been allotted???
Bhopal 56 seats present but 55 alloted
Bbsr 48 seats present but 42 alloted
Jodhpur 91 seats present but 89 allotted
Raipur 50 seats present but 48 allotted
Nagpur 16 seats present but 13 allotted

Patna 68 seats present but 51 allotted
Even though all these seats were allotted in mock round… but they are gone now!?