Weed plant strange growth?

Salve you sweet ones,

I just wanted to ask out of interest;

I have a plant that was planted on May 1st. Together with the others, they all grew equally well.

But then some "rows," or entire branches whose leaves became increasingly yellow, but not the entire plant. It also stopped growing vertically.

But after some time, the side branches turned greener again and grew strongly. The entire plant took off, but the sides are what stood out. With a difference of 30-40 cm, it's significantly smaller than its companions. There's this method where you tie the branches down a bit to get as much sun as possible, but even without that, it's grown quite wide and bushy, with strong, dark green leaves that feel like something out of a textbook.

Photo attached, maybe it's not worth mentioning, but maybe someone can tell me more about it.

Greetings your