There is benifits to mud, and drawbacks with mud.
I started with mud from the backyard, then progressed to store bought mud, then progressed to mixing my own mud recipe.
The pro mix grow I'm doing now to show noobs what not to do is my first non mud grow.
One problem with mud is exactly what is happening to you now. It's also why I said you are probably looking at a flush.
Been there, done that, didn't get a shirt..... :smoking:
With pH meters I usually check and adjust calibration after about every 2 or 3 uses. I've found that after 3 mine is usually off a few tenths.
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These ones are very reliable HM, they only wander about 0.1 per grow..
Anyhoo...
Gonna drench the pot, walk the dogs and test in an hour. [emoji2]
Gonna pH the water to 7 tho..