Same tent, same seeds package, same germination method, same soil, same light but big height difference. What could it be? Thanks 💚

If you want close plants. You need to use F1s. (And the f1 seeds need to be from the same mother, same packaged seeds) Seeds will never ever give the same strain. You'll get similar traits but, they'll always be slightly different. Even like twins, they're not 100% identical. They've dif finger prints and so on. This is the same with F1s you'll get very close phenos (same strains) but even then, there'll always be a slight difference Only by taking clones can you replicate plants. And even then. You need to be making sure to use a lux meter to make sure all plants get similar ppfd. So many factors.. This really is growing 101 mate I suggest you look up GrowWeedEasy it helped me a bunch when I started. Good luck

plants are not different than human even with the same parents not two child will be the same, just genetic ...

No 2 seeds will be the same mine had a nearly 1.5m auto that I tried to tie down and 2 bushier ones

Every seed is an unique organic living being with its own individual genetics, that will grow how it is "programed" to. No two seeds ever have the the same "program", even though they are the same strain and from the same packet. Breeders produce 100s of thousands of seeds to sell to you and me for a whole year, so the chances that the seeds we get came from the same "mother" plant are virtually zero, that is why there are differences.

No 2 seeds will be the same.