Mine started going broody as soon as they started laying. The same is true in my sister's flock. They turn out to be very nice broody hens because of their size. My smaller broody hens like my Hedemora can't fit that many eggs under them.How old are they? I've only kept them to about a year old - if they go broody at 2 years+ I would be thrilled!
I just had two more Maran hens go broody this week. So egg production is grinding to a halt. It's like there is a strike in the egg factory.