I've read a surge in calcium at any point can create a quick overload of nitrogen and that n can curl a few leaves. Did you offer them any C before noticing the curly leaves? I don't see a big issue as the plant is happy. Something did happen to curl her leaves though.Yeah, but I'm not sure why the sugar leaf curl tbh
First guess would be over water, but the fan leaves look ok
Second guess would be not enough airflow, risk of mould
What do you think @StoneOtter?