dead chicks need advice

[micko and jack]

hi everyone i had a pair of fantails on eqqs checked them this yesterday and the chicks had started to chip out this morning they were dead in their shells i removed the the dead chicks the hen and cock both returned and were setting of an empty nest and wouldnt come out of the nest box i it removed the hen and cock and then removed the nest bowl liner and the birds returned and are sitting in an empty clay nest bowl what should i do micko