DFRobot Gravity: analog electrical conductivity meter V2

Good morning. A couple of days ago we received a sensor from your house (DFR0300) and when it was time to start calibrating it with the solutions indicated in the instruction manual (1413us/cm & 12.88ms/cm ) the values are not consistent. Following the steps indicated to carry out the calibration, when we introduce the probe into the 1413 us/cm solution, the indicated value is 12.88 ms/cm (approximate). On the other hand, when introducing the probe in the 12.88 ms/cm solution, the value shown is 36.50 ms/cm (approximate). All these results have been the result of the steps indicated to follow. Any help is appreciated