Why does the api test kit give weird readings

SouthAmericanCichlids

I was trying to lower my ph (it used to do this a while ago too when I added fluval stratum to one of my tanks, before it went back up), but it gives me on the high ph lower than the lowest reading, and on regular ph, higher than the highest reading, I heard some others have had this problem too.
 

StarGirl

Show pics of your tubes. So everyone can give opinions. ;)
 

SouthAmericanCichlids

Show pics of your tubes. So everyone can give opinions. ;)
I can do them again if you want, but one was dark dark blue, much darker than the darkest blue color. And the other was very light brown instead of, I guess this is the best way to put it, baby poop brown.
Here, but the blue isn't as dark as I remember:


WIN_20210905_20_50_08_Pro.jpg
WIN_20210905_20_50_23_Pro.jpg
 

StarGirl

I personally would say 7.8-8.0
 

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