Growmie, I think there's just a bit of everything going on 😅
It really stretched out on you, you can see that right away → at the beginning, I was pretty sure it was too little light or the lamp was too far away. That's why the airy buds later on; it just never got the right pressure.
And the leaves with the spots… that looks like a classic uptake problem to me, something like CalMag or pH not quite right. Especially with autos, it happens quickly; if something's a bit off, they start acting up right away.
So nothing completely "mysterious," more like: not optimal light + a bit of nutrient stress → results in exactly this.
For the next run, just run the lamp a bit more aggressively and keep an eye on pH + CalMag, then it'll go a lot better 👌
Happy growing, growmie! 🌱💚