I almost threw out some of my chicken eggs from June 26th and June 28th. I have one hatching now from June 26th and this is July 20th, making that egg 6 days over do to hatch. I saw movement in another egg marked June 28th also over due. The humidity has been bad, so I now keep the small air conditioner on low. I don't know why the chickens are hatching at a late date. I sure hope the rest of them hatch to.