Chow_13answered grow question 3 years ago Its hard to say it could be nothing but most likely the start of something, here are some possible causes
-Calcium deficiency, Are you using tap water,RO,distilled?
-Nutrient lockout from feeding to much. Usually the tips of the leaves clawing down and/or the very tip goes brown will be the first sign But I think this is the cause as it looks like your new growth is twisted and the tips are burnt. Are you watering in between feeding?
-A fungus like leaf spot( Leaf Septoria )
Happy Growing