Hi mate, I dont see any stretch, suggesting light is sufficient. If I had to guess, I'd probably say it's a watering issue.
I stunted one of my plants for 4 weeks. (The back one in my photos) she picked up massively. So yours will I'm sure, if its watering.
What is you water PH and how much and how often are you feeding? What is your pot size?
If I were you I'd make a diary it makes it a lot easier to get help 🙂