What's wrong with these leaves?

TheGreatSouthern

Well-Known Member
Soil ph around 6.5ish
Strain is critical kush auto
Under 600w led
Ignore the white marks, that's just residuals from a cal/mag foliar spray.
There are just a few plants with leaves like this, setup is a 4*4 SOG with about 80 plants from seed, one particular phenotype seems to be doing this. I've grown the same thing five or six times now with no issues.

TIA
 

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