LED grow. hairs turning brown on tips

I'm about 4 weeks into flower. my question is: the tips of the pistols are turning brown, is this normal this early into flower? my grow: https://www.rollitup.org/t/1st-grow-cali-lightworks-solarflare-220w-led-secret-jardin-ds90ii-3x3x5.860233/page-2#post-11415287 click for full view!

I use LEDs
It looks like the hairs are just being banged around by adjoining leaves.
Overnuting will cause them to brown, inadequate watering during flowering, and heat stress will also do this.
From the picture I would say they are just being knocked around..which causes them to brown.
Just clear offending leaves and new growth will be normal/