Hi growmie😊
It's normal, every strain is different and even more so, every pheno is different. I had something like that too.
The other thing is, as
@gottagrowsometime says. 24/7 light for an auto is doable but strange things can happen. From everything I've read, 18 hours on and 6 hours off is the best. Slight yield increase with more light but up to 20 hours on and 4 hours off. After 20 on and 4 off, nothing else happens except stress for the plants. Yes, with photoperiods, you can totally leave the light on 24/7 during the vegetative phase for even more yield, but you should also make sure they don't have any problems. But autos under 24/7 light, if they have other issues too, then everything gets even harder because they can't recover. 😁
Happy growing ✌️💚🌱