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The veins have disappeared and condensed into rings in the ones we've noticed while the others are thick and lush with veins.It won't be a humidity issue as that can swing from one extreme to the other without affecting the eggs as its the average humidity over the course of incubation that matters.
It can be caused by temperature extremes when the eggs are stored prior to incubation. Or the temperature fluctuating at a critical stage in the development of the embryo.
Is it one particular breed that it seems to be happening to or was it that particular spot in the incubator?
Are you 100% sure they are blood rings? I only ask because eggs have tricked me before, looking like blood rings but it's just been the beginning of the veins forming.
For a while it was one section, but we found three today in other parts that had been healthy yesterday and now have hardly any veins beside a thick circle around the diameter