Flowering Week 7 - Leaves Curling Up and Down!

Only 2 of 12 are showing symptoms
Tips are curling both upward and downward
I think it may be nutrient burn, but not sure
Edges of leaves are browning as well, not just tips all around edge
Sorry pics arent great, best i could do

ur in week 7 how long strain time?
id leach middle pic man as it looks overfeed or underwatered .(its same thing to the plant in a way over feeding =too much food ////underwating =ec spikes causing unbalanced ph/ec/ppm resulting in unavable nutes that are there but locked out.
from sized nugs id say ur using little 75-100ppm more N she needs and way less P,K then she craves.
do u get run off 20% ? if so ppm /ph compared to input solution be handy
do u not drop N out round week 51/2 and adding the minused amount plus 10%flower to boost those babies 6week mirco 7 all flowering juice (try on few next time works good )

Make sure your ph is ok and just dont overfeed them.you are at week 7 they look good just some curling ,i would not worry about them to much ,you should be about ready to flush and then dry out for harvest time so good luck