Organic nute ph raises as bacteria and microorganisms break it down. There are different methods to stabilize the ph at the lab where it is made but not knowing the ingredients it would be difficult to say. Basically you used to much I would think. Did you ad ph up at first at all.

Hanna sells a meter you can check via cell phone. I called them wiinter of 2005 to ask if they had a meter with a remote control so I could switch back and forth from ph to microsiemen reading while I was experimenting with different ratios of nutes at my home. I had the hanna 9044 which is a constant monitoring but the display screen with the buttons was a few feet away and I was feeling lazy. Well they did not have one but they told me they had just made a meter that had not hit the market yet that I could check via cell phone. They had a price for the meter which was I believe around 550usd. And the lady told me that I would still need a adapter for it which acts as reciever for the phone to plug it into the line. They did not have a price of the adapter at that time but she thought it would be like 20 dollars.

One love
c

You should call GH tech support and see what is up.