Overwatered and the light is too intense, turn it down to 25%
Edit: When they are babies I don't even water them with a watering can or anything, I just get a cup of water and sprinkle some water on top with my fingers and or use a Syringe
Your humidity is also too low, you want to be aiming for around 60 - 70% at this point, you can pick up a inkbird humidistat and a humidifier for around $100
Also, your temps are a little bit low, you want to be aiming for around 27 - 28c
Your super lemon haze plant looks fine, I've grown those out a bunch of times and it looks totally normal for a super lemon haze seedling, just go easy on the watering and you should be fine