Why are not all the same

Like other said. Seeds are not twins or clones. They are their own thing and as such with all some things other seeds do not. Think of it like siblings you are not identical to your sister or brother, if you have one, think of someone that has one if you don't. Seeds are the same, Phenotype has different outcomes and weed is inbreed a lot and does weird shit.

Not much to go by but here is my best shot. Yes they may have been seeds from the same package. Each seed is its own individual with a specific DNA. So yes they may all be the same strain but not every seed will perform the same. It’s like asking why you and your siblings aren’t the same. You all came from the same parents, right?! But each of you are your own individual. Well it’s the same thing with seeds.

Different phenos might grow at different hights, a net or LST in veg could help keep the same hight