Hey bro, the canopy is amazingly lush, some of the healthiest cannabis foliage I have ever seen.

What caused this?
I don't know. Like I said, I've never seen it in cannabis plants before.

I don't know either, it looks similar to how two new stems will emerge from a new node that's been clipped, but since you didn't perform any surgery on the plants, and it's a natural occurrence, it's a bit perplexing.

I have a guess, and it's only that. I think the plants are so healthy and growing so fast, that it had to burst out with new foliage because the photosynthesis is just on fire, and probably the soil is amazing too.

Thanks for sharing, I hope my plants burst out new leaf nodes like that :D