Adjusting Rate of Temperature change to match with Oven

Hi There,
I have a nanodac temperature recorder that doesn't match the actual rise in oven temperature. For eg if the oven and the recorder show 100c each and I then increase the oven temperature by 25c, the recorder shows me 145c. It is pretty constant too. That is for 25c change in temperature, the recorder temperature changes by 45c. How can I adjust this?
Thanking you in advance,
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