KHD does NOT correct my alkalinity

[Adri-DSR]

Hi,

I have the KHD installed now for 4 days. It measure my alkalinity at 7.5. I have the nominal value set at 8.
I am using the ADD-on setting:

Volume change: 3
Limit for KH Raise: 5
Limit for KH lower: 5
Calculated adjustment: 1

Pump 4 is used to dose the KH solution 24 times a day.
My KH solution strength is 33.3 ml / 100 liter to raise 1 dKh.
Correction strength is 16.6 ml / 100 liter

My tank contains 334 liter. So to raise my Alkalinity from 7.5 to 8 the KHD needs to dose 27.82 ml extra. The calculated adjustment is 1 ml. So after 1 day my Alkalinity should be at 8.

Why is my Alkalinity still on 7.5. It already should be at 8 now after 4 days?