Classic foxtalling some strains are just prone to it at the end of the flower cycle as a kind of last push type thing it can also be caused by heat and light leaks in your grow space
It is because of heat stress. Some of my autoflowers would do that a lot near the end of their life because temp was too hot.
Do you mean how some parts of the bud form into little kind of "towers" that come out the top of the other parts of the bud? I don't see a problem here. Not sure what it's due to, just that it's commonplace and seems to be how certain strains are structured in terms of their flowers. I was a bit tripped out when I first saw it on some bud I bought too.