towellieanswered grow question 2 years ago I think it might be heat stress, but honetly I don't think you should worry yet. I suffered from the same issue with one of my plants, but the stress was more severe 😞
What you can do is reduce the light by raising the distance of the lights from the plants, or decrease the light power if you have a dim controller. Also, you can put a fan to better the airflow and uniform the temperature inside the grow.
Enjoy grow bro 🙏🙏