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Your pic looks as though your plant is around week 5 of flower. I have a garden thats just finished week 5 and i have no die back on my pistils yet. But that is my strains characteristic's. There's more than 800 varieties of Cannabis now with all the breeding and hybrid cross breeding. They are all different in how they grow, stretch, flower, and die. I say if your leaves looks healthy and they are stretching up to reach the light, then you are ok and have nothing to worry about. I see white residue on your leaves. If you are foliar feeding or misting them, stop doing that. Your making a mess and providing fuck all to your plants, other than opening them up to bud rot or making them vulnerable to pathogen infiltration.