you mean to say that they put eggs but they did not hatch
that is quite normal in parrots and FHs as it is
and i think this should be much more prominent in a hybrid of FHs and parrots(that is what i think might be the mix)
it might be that the male you have might be sterile
or it also might be that your males first try at doing it wasn't right and if this the case then he will learn to do it right in a few more attempts
good luck