That is a better way to tell at what temperature your incubator is running than a thermometer. Since they are early, your incubator is too hot. I've got the same problem. Try adjusting the temperature down about a half of a degree Fahrenheit for your next hatch if you have an adjustable thermostat.
Even with them this early, you may still get a pretty good hatch. My first hatch was over 70% even with the incubator being a bit hot.