Why is my 3 female rabbits only had a litter of 2?

i dont know if its the male or the females? i brought my male rabbit at the fairs, he is a show rabbit he is 1 year old. i brought for 100 $ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!… the 3 female some one gave me them. this is really weard one of my females had only 1 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…