hi dude ...!
first : most of the time it comes from the genes... and indica or indica dominant plant are more little and bushy...
secondly : most of the time lamp are a bit too close from plant....if in case of growing a sog or sgrog it coulb be a good thing..... but for normal grow or for auto i recommend to play with the phototropism of the plant...
raise your lamp and the plant will follow the sun(light) and grow taller....you have to find the right setting for the right height
the goal is not to have the plant stalk either...and if you don that correctly u can increase the yiel at the end 👌
happy growing dude !