Yellow label what is the reason of this?

Pot size : 29 lt
Ph :6.2
temperature: 83’F
7 plant
2x600 HPS light
Flower 6
moisture: %42

fertilizer: Advanced nutriens
Micro , bloom,Grow
Big bud, sensizm ,owerdrive , cal mag
light distance:55 cm

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Have a look at post 6.

lower leaf normally
Up leaves yellow

what should I do ?