OPKs and why so different?

[CupcakeGirl2]

Hi ladies so I have two brands of OPKs and I did both at the same time. One says positive the other two are just faint. The two faint ones are new tests I just got today in the mail where as the dark one I’ve been using this brand all month and they have gradually gotten darker. Why would One brand be positive and the other not? Both from the same urine

 

[CupcakeGirl2]

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[Bump288]

In the same boat ‍

 

[missielibra]

Well if you take a quick look at the reviews from your new brand it seems to happen a lot. Lot of people seem to say they got positive on many other brands while those stayed negative.

Ive never used that brand so I couldnt comment on it but when Ive used wondfo, femera or easy@home Ive always gotten similar results on all three.