What’s going on here?

Isn't that light burn damage?

badly damaged leaves are going to die so depending on how long ago you flushed it's gonna take time for it to run its course have you determined what the problem was? https://dutch-passion.com/en/blog/a-visual-guide-to-cannabis-deficiencies-n987 try this link or google cannabis deficiency chart you will be able to determine almost every deficiency. most are easy to fix others not so much Good luck

You cant keep asking questions without any details no diary to reference to And pictures very bad quality upload more pictures and maybe start a diary

Looks like bud rot issues to me

way more information needed, what are you growing in, how are you feeding them and how often, temp/humidify. Autoflower or photoperiod, hours of light per day. what was the first signs you had, pictures of the first signs on the leaves, PPM/EC going in and run off values,

Some kind of root rot or bud rot i think 🤔