When you get leaves "canoeing" like that, it's because the temps are too high or they're too close to the lights.... it's caused by heat.
Do start a diary on this grow - she looks good so far and diaries help us help you when you've got questions or worries....
Good luck!
Too low humidity, or high temperature can cause this.
Do you check how high is your vpd?
I can see that leaves are curling on top, so I would say combination of too much light with high temps