Strange meristem growth

[Yardy1986]

Hello I'm having some strange grow from my cannabis plant that I think is caused by a pest what could be causing this-the tops have stopped up to regrowing so I cannot flower the plant

 

[exploziv]

Can you see any signs of pests or related debris on the leaves or under them?
I would think thost plants are very hungry, so they might have some severe micronutrient def that makes them grow weird tips.. that's almost guaranteed if no signs of pests are seen.