alll of my chickens been laying for 2 months now, and never any eggs with soft shells. today i think two of my chickens laid soft shell eggs because there were two broken soft shell eggs, one was white and another that was tinted pastel green ish. is there something i should be worrying about, or does this happen to chickens once in a while? i always have a tray where i put oyster shells that my chickens can eat whenever they need it. so i dont think theyre lacking calcium.