Looks like they are doing their thing. Some strains/genetics do just like trees in the fall. Only thing I see is the tips are a little extra burnt. Good looking plant.
Welcome to the community @Gman1007
You’ve got a beautiful plant going there!
It’s normal for them to show N deficiency later in flower. They still need some but don’t overdo it… that’s where the burnt leaf tips might be. Most ‘bloom’ nutes have much less N than ‘veg’ nutes.
If you need help with anything, keep this as your journal and just tag some folks… If you tag me and I don’t know (which is normal hahaha), I’ll invite the whole crew over LOL
I would GDP is a strain that fades the leaves more than the median strain. Especially getting towards the end of flower. I think you are in the normal fade window.
Welcome to the forum and nice looking clean grow. 
Welcome to the forum 
Nice plant!! 
Nice looking plant ya got there!, if I may suggest looking into supercropping. You appear to have some gnarly foxtailing starting at the tops of the tallest mains, which would indicate they are getting waaaay more light than the buds at the bottom.
What is that you are growing in?
It is the Grow Abby Pro
Nice I’ll have to goole that.
This was my experience with GDP.
