that's mag sulfur deficiency from the pre flowers getting close to the light and growing out so fast 👍 plants need help when they get perfect conditions and lots of light , get some for flower and you might even stop it spreading as you go on. Hope this helps ! 🚀
Could be a magnesium issue. Hard to say really but if the rest of the plant is unaffected then keep doing what your doing. Like a rainforest in there man!