Could be lack of light in ppfd and or spectrum issues, such stretching is due to not topping and too much red light spectrum during the grow period. Could you take a picture with natural light?
What is your watering schedule like?
How much water are you giving?
Pot size?
Temps and humidity?
Drooping leaves are signs of a few things like under watering, over watering, heat or light stress, insufficient ppfd or par levels, low potassium levels.
If your plant is underwatered for prolonged periods it will begin to wilt and droop so check if your leaves feel crispy or dry to the touch. If they do then water with the correct pH no nutes if you're using synthetic as you could have a salt build up, heavily saturate the soil until you have run off from the bottom of the pot. Then water when the top of the soil had dried out about half an in to an inch but with half or less of the previous volume so you don't have run off.
Also water slowly if you're plant medium is dry, best thing to do is get a digital pH meter that can reach half the depth or more of your pot that also has a dry/wet meter and check daily with a plant that size.
Bigger plants, especially during flowering will want more water depending on your growing medium, environment and wether you're using cloth/air pots etc.
I provided a picture of my babies who were very thirsty last night, and in 7 gallon pots for big plants and 3 gallon pot for the baby.
With dry soil you need to water slowly since drier soil is loosely compact and has more air pockets and water will reach the bottom and fool you into thinking it's runoff without your entire soil medium being fully saturated.
In my case the best way around that is by water the plant in intervals vs try to fully water one plant for example my 3 gallon pot we gave her a gallon last night and the 7 gallon pots took 2.5 gallons and I'll water again tonight with half that volume since only the sides and the top of the soil will be dry being cloth pots.
The depth and density of the soil will retain water and a wet and dry period is good which inn my case a watering in the big pots were normally every two days but you need to water based on conditions and needs.
I uploaded another photo which is from the webcams inside my tent which is after they were watered last night, front view is before they were watered where you see drooping. Webcam cameras aren't in the best angle so some leaves will still look droopy since the camera's are pointing down will take updated pics later from outside the tent