Can dye run cause a false positive?

Autum • Oct. 2020 ❤️

So I took the test below, tweaked and untweaked. As you can see in the untweaked photo it’s looks like no dye run. But when I tweak it, it looks like there is? Regardless, the line is before the dye run even ends. So I’m curious if this test is valid? Could dye run even cause a false postive?

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