I agree. I have a smaller homemade incubator and I put the T-Stat probe laying on top of an egg in the center of the clutch, or poked through the tupperware eggbox and stuck at top egg level if the eggs are all piled up and stuck together. I put a second thermometer at the base of the eggs and maintain the top thermometer at 88.5- 90 degrees and the base of the eggs should be about 88 - 88.5.

This has worked for me perfectly along with the no substrate method.

Are you sure you didnt roll the eggs by mistake? Maybe the temps spiked? Do you maintain and check a min / max reading?

It dont sound good to be honest with you...

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