have you verified that you were getting an accurate temp reading? multiple calibrated thermometers?
I 100% agree with this, best to use multiple thermometers and 100% ignore the built in one, in fact cover the built in one up with tape or paint, paint a smiley face on it and at least it will serve the function of making you smile as it's a useless thermometer and hydrometer...
i question this because that model incubator is only 40 watts (and that includes the fan) so it pretty much doesn't have the ability to raise the temp 26° in an hour unless there was some major malfunction.
For that small of 'enclosed' and insulated space 40W is sufficient to drive the air temp up quite fast...
But, in that regard it's thermostatically controlled so beyond a few degrees of drift, climb or drop that is common in these types of incubators it should not have shot up in temp from just plugging the humidity holes, I suspect someone or something turned the knob...
May I suggest you remove the knob, leaving just the shaft to set temps, then once you get it dialed in take a 2 liter or similar pop bottle cap, and tape it in place over the knob to protect it from being bumped...
As for the eggs, as said let them ride for a few more days and candle, or let them run the full 21 if you can't candle and cross your fingers...
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