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first guess, the original thermometer is out of sync.
but, you have to have something good to start with. 75 is a little warmer than room temp. what does it feel like?
do you have any way to calibrate, or how do you know that the 3 are correct? set them in the room for starters, and it is a very crude guess, but you have to know which is correct.
what is your room temp? look at your thermostat, can you tell your room temp? then use your 3 to see how accurately they read the room temp, this will tell whether the 3 are correct, or the one in the bator is correct.
have you any experience with the 3 thermometers? do you trust this 75 degree read?