Maybe your males are shooting blanks! It takes two, if she's laying infertile eggs & that's her part, then my thoughts would be your males! Female chickens lay infertile eggs all the time! No males no fertile eggs! Jmt!!!!!
I bought a 30 gallon garbage can & put my beach sand in & wet it down & mix it together, pack it down, put a basking lamp on for heat! When my females get restless I put her in the can in the morning & if she isn't digging to lay!@ the end of the day she goes back in her cage until morning &...