Hi all,
I'm struggling to get the khd the read constantly or correctly

I've measured and double checked the lengths I've calibrated the dosing heads with digital scales I've calibrated the probe at 25°
All of the above seems fine and is correct I believe
I don't have any air in any of the dosing lines the pH probe is new in August and I've even brought a cheap one from amazon just to check and they both seem fine
I'm not sure what else to do
Any help would be appreciated


Screenshot_20211222-132006_GHL Connect.jpg