Hey captain firstly love the organic/ammendments only soil you've been using this grow, i hope you can reuse the soil next time too, I've heard they usually get even better results the 2nd + times. Anywho being that you did the bone and blood meals cant those be not immediately available and take a few weeks to breakdown? Perhaps it is a small nitrogen toxicity. I thought i had seen a few curled leaves even in week 8 just before the flower switch. The only other things i could think of were watering practices..possible wind irritation if you've got strong air flow in the room, or a light stress from the 24 hour schedule in veg (i only thought this because of the week 8 curl, but I'd think it would fix up after the change to 12/12).
I know thats not a very straight answer but maybe between several of us you'll work through the problem. I'm glad the overall health looks good and perhaps she just needs time as long as no more gets affected.
Happy flowering. ✌️