Yellowing and flowering only after a month! Gelato, what is you doin!?

First of all , my english is not the best. i will try my best to get it right , somehow 😋. You need to switch your light cycle to 20/4 or at least 18/6. 12 hours arent enough for autoflowers. Also lower your Lamp to 18-22 inches 😉. example for soil, growing with Biobizz Allmix your plant will need some food after 4-5 weeks . if you use BioBizz Lightmix you will need to feed your plants after 2-3 weeks. after 5 weeks of 12 hour cycle, the plants didnt had that much time to grow properly . there was no vegi phase at all , so they started to overflower already...they need some more nutrients (food) , i think your PH is way to high , so that stops the plant from gettin nutrients . lower it down to 5.8 to 6.5 asap . Next run try to keep the 20/4 light cycle , hold the lamp at 18-22 inches the whole grow , use 9 pots a 14 Liter on a grow tent with 1,20 x 1,20 x 2,00 , place the seed from beginning into the soil , 0,5 to 1 cm deep , use BioBizz Allmix and I guarantee you you will get a very good yield with some incredible smells and tastes 💪

Normally the new growth is lighter than the rest of the plant so that is normal but there is something going on you tell because the plant is starting to fade a bit in color. Also, this is a full switch to flower judging from the photos, autos can flower super early. I recently just got rid of Gelato Auto from Female Seeds and it grew funky the whole time too, could be something in the genetics.

Autos usually start to flower around week 4-5 so thats normal... Dont know about the lower leaves there but doesent look concerning to me. Cheers