I have some trouble with the leaves...especially the youngest...while the others react positively to watering, the younger ones still tend to the floor😒
I don't know how to act
I think you are underwatering. And the pot size is 9l. I think you should give at least 1l of water or more. And before next feeding lift the pot and u can feel the weight so you know if the pot is dry. And maybe move down your lamp. Also make sure air conditioning is good. But this is just my opinion.