What are the temp like.. Had a girl go 70 days pos last year didn't realize her heat panel had gone out double check the temps in her tub..
Same thing happend to me last year. My big girl laid 62 days POS, when I pulled her out she felt cold and when I check i found a connection broke on her stripe in the rack. She laid 12 eggs all with veins, but each slowly went bad except 2 that hatched out fine.