Hey there Corinna, long time ! I'm seeing both genetics and overwatering. sometimes these kinds of gens muscle through it and dont end up so bad, sometimes they're stunted, try to not give them so much water in the root zone to help them as much as possible. you know at that size you dont really need more than a few mL at a time . try to raise the humidity with a humidity dome or some spraying too : you're at 50+ rh you should be at around the 70-80% range . Hope this helps ! 🚀