hulkberry automatic late flower leaves yellowing?

This is clear overfeeding There's no undefeeding here. I know you've no diary. But, you've been feeding her either too often or to high of a ppm. She's clawing from excess N and your locked out PH wise. From too much NPK in your sub.. Typical salt burn. You need to hard flush that Add a diary.

Late flower if the plant is hungrier than what you are feeding, she’ll have a tendency to consume her fan leaves to keep producing buds. If your buds look great then I wouldn’t worry too much about it. However with no information on your grow the exact root cause of your situation, we can only make speculations.