Yes, now maybe I understand, the reason is the luminance which was too low even if Dispcal said 120 cd/m2. Dispcal luminance reading are not in agreement with Xrite software: the same luminance are read by dispcal as higher. Why?
There's a bug in the i1pro driver, and the absolute calibration is out by a factor of 1.37. It is fixed in the next release.
Below the DispcalGUI report with its final error when has to store the profile in the right folder.