do you know which type of Cattleya is doing this? i have several Catts that do this (mainly hybrids of Catt. aurantiaca and the species aurantiaca too) but i have found that if left alone and not dut off they ALL flower even though the sheath has gone brown weeks or even months before!

maybe yours are mungrels like mine are and will flower ok anyway??? dont reall know what to suggest otherwise, but i hope they are all ok!