Strange 2nd stretch during flower

Hi guys, first time poster. Im usually able to figure out my problems reading through threads. But this one is strange. Maybe its not a problem at all. Im growing a 13 week sativa called super silver cough. (Dynasty Genetics). 2 plants,Main lined, pro mix,11 gal smart pots. Ph of 6.5, watered every other day 2.5 gal, 1 2 day break, fed once a week with lucas formula at 1/2 strength, lights 1 foot above tops. Temps at 83° during lights on 70° lights off, Im in week 6 and all was going well. But night before last 1 of my ladies had a REALLY thin stretch on the top. The other one is coming along good. Both kind of stringy but its a sativa so im not that surprised. Ive included pics. If anyone has a useful opinion id sure appreciate it.

Bump

could be a tiny light leak cause new vegatative growth, I've heard it said that to much nitrogen in flowering can cause buds to grow those stringy bits as well but I don't know for certain if that is true

I was considering nitrogen toxicity so i flushed yesterday. Ill give it a couple days to see what happens. But a light leak is literally next to impossible.

O.k flush hasn't seemed to help. Any other suggestions?

look ok to me , just little too much N but still nice , wouldn't worry , id just give plain water for couple weeks , they will be sound , you gonna have some nice cola`s there

Current with a macro. Thx just haven't seen thin offshoots like this before.

Still no dice maybe weak genetics? Now those tops are floppy.