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Test Strips Disagree

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So, I've been using API 5 in 1 test strips for a while. I recently got some 6 in 1 strips from Aquarium Co-op. Today, I tested and my GH was 300 ppm. It's normally 30 ppm. So, I looked in the API can and found one last lonely test strip, tested my water and ... 30 ppm. I tested again with the Aquarium Co-op strip and got 300 ppm again.
All the other tests on the strip are reasonably well matched.
Has anyone else run across this?
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On 8/1/2021 at 9:52 AM, Patrick_G said:

I’m also trying to figure this out. My strips always measures 300+ ppm while my API liquid kit indicates 4 degrees GH (180 ppm). 

Fwiw 4dGH is about 70 not 180.  I have about 8dGH and mine read closer to 300.  In my softer water pond they tend to read more accurate.

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