They were though both ready to hatch because they had pulled completely down the clear sack that surrounds them. If they had what you feel were large yolk sacks, than that would mean your humidity is to low. When the clear sack is gone and embryos struggle, it's very easy for them to get upsidedown. For the future Andy, the next time you see an egg like this and it hasn't hatched it's time to go in.
Danny
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