Hey hip hop. To me from the pics it looks like your pistils are browning? If so thats very normal and important and is a sign of maturity.
If it is the leaf tips on your sugar leaves (the very small leaves) that also is very common in the flowering stage for the leaf tips to start Browning and changing colors, yellowing and dying off.
Love the purple you've gotten out of this plant. Happy harvesting.✌️