Flowering problem, week 3-4

Look for seeds in the buds if they are pollinated then they will all be im afraid I lost 28 at Christmas its a pain really is happy growing

It looks like it has been pollinated, are you sure your photoperiod "unknown" isn't a hermie? Hermies are a big risk with bag seeds. Without a diary, it is hard to give any real help, nobody knows what you may be doing or not doing.

I would flush and add nutrient a lil bit and lets it recovery then add full line of nutrients. I thinks pistil its starting to burn due to excessive of nute or ph problem

Looks like they want more potassium and are they close enough to the light for flowering? Possibly not enough water or too much. Hard to say on limited information.

using any sort of foliar spray? some stuff will bun pistils pollen contamination? look for nanners etc... once knocked up pistils will die and retrarct. it's all over the plant fairly evenly, it seems... so probably not a light related issue. 900ppm could be a bit high? but i don't know of any nute symptom that does that to pistils, and 900 isn't crazy high or anything.... genetics? hopefully some process of elimination makes the answer more obvious. way too early for senescence.