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High humidity for a little bit wouldn't hurt anything. If you're certain the temperature was 99.5 F, then my best guess is that either you were sold very old eggs, or they weren't fertile to begin with.

They are not developing :( Maybe they were older than you were told. My only other thought is, did you double check with a calibrated thermometer to make sure your temperature really was 99.5 degrees? Sometimes the incubators are off, but usually that's not an issue with Brinseas.