Need help dealing with pH drift in tank using a 12.9 gallon autopot self watering system

Growlog link: [paste your link here]

If you don’t have a growlog please answer these questions.
What strain are you growing? Is it Auto, Fem or Reg?
Are you growing Indoor or outdoor?
Are you using nutrients? Which ones? How much?
Grow medium Coco
Auto pot 4 pot Saturn 12.9 gallon tank will drift after setting the pH it continuously drifts everyday I correct it and it goes back up. Had anyone seen this it had went up every since I turned on the system. I check the pH 2 times a day and correct. I have no clue what’s choosing it. My next off day I’m cleaning my tank and starting with new nutrients. I’m at a loss for answers