Height issues

Some plants just don't get very tall. Even from the same seed pack you can have different height plants.

Im gonna go with ctrellis90's answer, ut more info would help,what soil, coco, mix,how much perlite ? Any nutes. I learned same way did 2 tents 4 diff subtrates, 1 coco,1 coco+soil,2 soil but diff types, i found the 1 with foxfarm soil and foxfarm grow,exploded in growth so much so as i had to lst just to keep her low enough to stay in tent. The plants i grow love the npk during veg a d bloom during flower.now if i can just get curing down to a close degree ill be happy.

So I noticed you don't have any nutrients listed so is that because you don't feed? If so that's most likely the reason why and I'm surprised your plants look this healthy because you're growing in coco which has absolutely no nutrients whatsoever. You're supposed to be providing nutrients from day one when growing in coco. Most companies sell two part coco nutrient feeds that you can use throughout your grow. You also need to maintain a ph between 5.5-6.5 in order for your plants to be able to properly absorb the nutrients you're giving them. I hope this helps