Week 3 in flower Brown Pistils dying leaves

Hey guys I’m new to this Blog stuff I’ve been trying to Diagnose what’s wrong with my plants but basically A while back I was ph my water and I realized it wasn’t calibrated right in just a couple weeks I’ve noticed that the pistols on my nugs are turning dark brown but not the nugget itself. Is this pollinated? or is this the pH burn? or is it nute burn? Or russet mites?
 

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