Hey
@Auwia!
As RQS says, it's a plant that needs around 8-10 to be completed. So, around 4-5 week she is gonna stop growing and start flowering.
I recommend you to give them some nutrients and lower your LEDs to 30-40cm height since you maybe only have one more week to complete their growth and theyre a little small for been on the 3rd week.
Also, there are some autos that doesn't go well with 24h schedule. Try 20/4 schedule to see if they get better results.
Good luck with them!