What’s this curling??

These plants have this curling happening and I’m not sure why. is this a nutrient issue? I keep lights on 18 hours. Indoor grow. Lotus nutrients. One is 7 weeks along and the other 6 (flower). I’m on top of my pH levels. Temp 73 and humidity 58%. The buds look good but those leaves concern me. Any advice welcome!
 

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Looks like your letting them get to dry between waterings. Try keeping medium used moist not so much wet but wetish if that makes sense. Also maybe a potassium phosphorus deficiency I would give them some epsom salt with my next watering to help level them out and get them to finish out stronger.
 
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