Digital BW, The Print

Is the 4800 meant to be operational?  I just tried to print the calibration
page with a curve with which I had simply set the ink limits back to 100 and
changed CALIBRATION to YES.  I got very weird results:

K  only printed steps 80-100
C 65-100
M 65-100
LC/LM 0-100 but 70-100 gets lighter again
LK 30-94 with 90-95 lighter than 85
LLK 0-80 with 50-80 lighter than 45

I am sure I am doing something stupidly wrong but I am sure I chose QTR
Calibration to print the page.