I think topping is why, but that's not a bad thing. When you top you get more, buds aren't as big but more of them. If you want bigger denser buds I would do as @BigSm0 and do zero training. That goes against everything I do cause of tent size lol. Also supercropping will help with bigger buds, but not all strains like it. What are your strains? Lollipop has made a difference when I have done it too.
I am going to just do LST for the next run. Strains that didn't work for topping are MG Fantasmo and Sweet Seeds Red Poison. They worked ok, but were very slow to develop buds. Next run will be Sour Livers, Bubbly Livers, Fantasmo again Gold Glue. Not going to top any of them.