Can't figure out what's going wrong here...

I agree with the other below, A bit of fotailing. I had some of this on my autos outdoors this year, for me it was caused by heat and water stress, not having enough water when hot and then to much when I got home from work and could water them finally. It is also late into its life on 13weeks I feel. I kept my one auto diary going past this time frame but only because it was making seeds, I think you are entering your end of life for the plant and its going to start to fade and this might be how its looking atm given the medium is nicely fortified. I would give it a week or two more and monitor it, If it keeps foxtailing then just harvest it, can't control the heat outdoors, make notes it would be better as an indoor strain to try again in the future. I bet indoors it would have bulked up a bit more and had a thicker nug structure and growing pattern. Good looking plant none the less! Happy Growing! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***

Looks like foxtails.dont know for sure.foxtails can have many reasons to start growing on buds.maby temperature spike.i had it with the end of flowering in my auto euphoria. Temp was spiking in day and dropped to much at night. Hope you will find the problem