Your problem is your ph is too high,leaf wrinkling or twisted if the effect of it and this a common problem with indica dominant plants.
They still produce nice sized buds but they can't handle ph fluctuations and i can guarantee you if its not fixed then you will end up
with calcium deficiency,if you don't have ph down try lemon juice,DO NOT USE VINEGAR no matter what anyone tells you,it stinks
and can rot your plants from the inside out and that will also smell horrible.The best solution i can offer is to use plain purified water
to fix your problem,do NOT add any thing in the nute department. hope this helps Good luck