Nute Burn?

Overall all your plant looks fine , might be the beginning sign of nitrogen toxicity, Dark green leaves, shiny leaves, clawing, weak stems, and overall slow growth. Marijuana leaves that are nitrogen toxic often get “The Claw” or talon-like leaves that are bent at the ends. They also do an odd curving (or cupping) that is often mistaken for overwatering, but is unique to nitrogen toxicity. just back off a bit with the nitrogen for a few feeds and you should be good . Hope that helps and good luck to you