Endress Hauser pH Sensor Calibration Help

Hello guys i have pH sensor CPF81D-7LH31 and i have problem with slope calibration,
during calibration when i put the sensor on buffer 7 it read very close to 7
and when i put on buffer 10 it also read very close to 10
But at the end calibration Slope is below 55 (so i get calibration Alarm)
between buffers i clean the sensor with IW and gently wipe it with soaked wipe

According to your measurements, the slope is very close to 1, so set it to 1.

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