3 weeks! Too early for flowering, right?

I agree. In the morning light, they revealed themselves to be the newest leaves. No problem. I can wait. 😏😵

It's normal for autoflowers to begin the flowing stage at 3-4 weeks this is why they suggest not using HST techniques on autos. 🌱👍

For an automatic - yes. This looks normal to me. I actually run a 24 hour schedule on my plants and they are turning out good. That looks healthy and happy, it will still grow and bush up, extend, etc. (I personally never trim/prune/defoliate autos.) You can run 18-6 as well which is commonly practiced. As far as light distance, it shouldn't have any affect on when the plant begins its journey to through bud-hood. Distance should only matter as far as your light specific setup suggests to change based on where the plant is in its lifetime (24" veg, 18" when it begins flowering as an example). Like I said, light model specific. Sorry if this is too much information and I am babbling on!

MY AUTO FLOWERS OFTEN LOOK LIKE THAT IN THE FIRST WEEK. MY CURRENT GROW IS 4 WEEKS AND THERE ARE BUD SIGHTS EVERYWHERE. LOOKS RIGHT TO ME.

It can certainly be, its nothing you did, just genetics, and nothing wrong with it. Happy growing.