Anyone please let me know why my plant
If possible fill out ilgm support ticket will help you to get more feedback. If not already you might try adding a little calmag.
Those are very specific and dark spots with no borders it looks like damage but otherwise I would say calcium deficiency (which can be caused by lack of calcium or PH lockout so ensure your PH is ideal and the plants getting enough calcium)
Did you drop water on them? Were you rough with the plants?
Have those spots been touching the side of the tent as it sucks in when your exhaust fan kicks in?
And agreed with @kellydans support tickets help us get a better idea of what’s going on.