Missing potassium or else

Cud anyone advice on this little problem.
Is this an early stage of potassium deficiency or else.
Not all leaves have this symptom
Strain ; Northern Lights fem
PH ; 6.5
Lights ; Cfl - 200 watt
Early flower stage
( The drops on leaves come from bottle spray)

What are you feeding it and are you supplementing with Cal/Mag?

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I have miracle grow and using just minimum amount. Otherwise just normal water. My pH is around 6.5, under 7.
What I have noticed that only some leaved showing the symptoms, and they are top leaves next to flowering head.