Any clue what this is about? Wondfo brand OPK. I have used many others from the same shipment and none of them did this. The blue line showed up immediately, even before the control line. After 5 minutes, the light pink test line appeared behind the blue.

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That's definitely not right. The line shouldn't have come out blue, the due isn't even blue. These are mine:

Negative test

Positive tests

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Weird. I would try another brand.

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Brighter oic, taken just after I tested. The negative test line has not yet appeared behind the blue.

Let's Glow!