Problem Leaf

i have 5 grape ape ,and other kinds. They have all been in flower for 30 days,every plant except the grape ape looks great,fantastic.The leafs on the grape ape are turning,curling down,i have not over watered,i have no signes of any stress,or lack of anything. The are in organic soil mix every plant that ive grown in this mix does great but the grape ape.
 
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