I have a aquarium of 300 gallons full of acros, my normal dKH is 7.2 according to to KH Director , if i do not dose alkalinity every day the dKH goes down 2 dHK.

The KH Director measures every 2 hour the alkalinity.

The situation with the KH Director is that all Saturday the measure was 10.2 dKH and I saw multiple times that the KH Director do the measure, but the HKD software says that the last measure was on Friday at 11 pm. As I found strange that the alkalinity rose from 7.2 dKH, where it is regularly, to 10.2 dKH and that data was the same all Saturday and additionally that the screen said that the last measure was Friday at 11 p.m. That Saturday night I measure the alkalinity with the Hannah Checker and the measure was 6.8 dKH.

Sunday morning was same, HKD reading was 10.2, no alkalinity was added since Saturday. Sunday afternoon I recalibrate dosing pump 1, 2 and 3 and also recalibrated the PH probe 2 times and I do a new measure. the reading was 14.4 dKH instad of 10.2.

Thereafter all measurements mark 14.4 dKH. The last check was manually 30 min ago and measure was the same, 14.4 dKH. So, I measure with the Hannah Checker and have the alkalinity at 5.8 dKH. The KH Director software screen says that the last measure was at 3:45 pm on Sunday, but i have done lots of measures after that time and also the scheduled measurements of 5 pm, 7 pm and 9 pm have also been made. I attach a image and would be thankful for any help that resolve the problem.khd.jpeg