Curling flower leaves (only at the bud)

may be nitrogen overfeed but no worries, just flush the soil with a lot of clean water and let it drain and be washed

seem's like a photoperiod problem.. that make a little degeneration, tchek if the light cycle is respected (no light during the 6h of night, if you are in 18/6) theck this site https://ghostseedlab.com ou the facebook page GS.lab there is lot off informations for cannabis pathologys

Yes, you’re dealing with a slight overfeeding – most likely too much nitrogen. But overall, your plants still look healthy. Since you’re growing in coco, it’s important to water with a pH between 5.8 and 6.0 to ensure proper nutrient uptake. I recommend watering 1 - 2 times with just pH-adjusted water, without any nutrients. Alternatively, you can use pH water with a light PK booster – this helps reduce nitrogen input while still supplying phosphorus and potassium, which can support healthy flowering and correct imbalances. Also, I saw in your diary that you’re hitting around 29 °C in the tent. That’s just a bit too warm. If possible, try to keep temps under 28 °C – that small adjustment can improve overall plant health and reduce stress. Your environmental parameters (light, humidity, etc.) look solid otherwise, so with these tweaks, you should be back on track in no time. After that, you can gradually return to your regular feeding – ideally with each watering in coco, always allowing for some runoff. Keep growing like this

Way over fed with (nitrogen) fertilizer long term. Excessive feeding can cause stretched leafy buds at the expense of density...............reduce your feeding.

Some genetics do this but these look like it could be too much nitrogen.

heavy nitrogen i would guess. its nothing to worry about but maybe cut back on the nitrogen. plants still need nitrogen for the stretch phase at the begining of flower but not at the samr levels as vegetative

That's normal, leaf structure at the buds is different.