Why some plants they show lower terphene profile respect what aspected?

if it had the "right" genetic, it wouldn't come out the way it did. Agitation and stress often increases smell... all that matters is how it smells at the end when dried and cured... don't assume things too early in process. Less smell can be a good thing early.

mi è gia capitato che l'odore arrivasse solo alla fine ma se passi il dito sul tronco e anusi sentirai..

There’s no smell at all? Are your plants flowering? You won’t get a strong smell till flowing starts. Many things can affect a grow, would need more information!