Anyone know the issue?

Day 37 of flower - 28 degrees RH 50% - feeding at 1.5EC (1.4 A&B + 0.1 of bud booster) 3x a day - light 27” inches from the canopy. PH 6.0 each time I feed.
 

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Looks like it could be some physical damage caused at that point. There’s no other burn on the other leaf tips, or signs of bacterial infections or pests. A pic of the whole plant would help too.
 
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