IBS-TH3 wifi calibration setting in app

How do you use the temp/humidity calibration setting in the app for the IBS-TH3?

Hello,
It is used when there is a deviation in the IBS-TH3 reading.
For example, if the temperature reading is 3 degrees higher than the actual, the temperature calibration value can be set to -3. If the temperature reading is 2 degrees lower than the actual, the temperature calibration value can be set to 2.
The same applies to the humidity calibration value.

Ciao,
Could it therefore happen that the sensor reads the wrong temperature? what is causing this problem ?