Stunted growth. Yellow leafs and red/purple stems

Thank you for the answers. Yes I know it's natural when the plants get close to the end to get yellow and show colours. But the stem got purple red quite early in the blom. And it's not one of the purple strains. Yeah it looks beautiful and bigger on the picture. But it's kind of small and a little bit disappointing in buds. Just trying to find out so she can get it better next time. Biggest mistake was to use biobizz allmix that seemed to be to much Nitro in for them in the start. Even if I made a hole with planting soil and put the seeds in. Going with the light mix the next time. Autos seems to be very picky so need the be careful and give them light nutrients only and see how they react. We live and learn every day:). Thank you brothers and sisters out there. Peace out✌️

Hello, depending on your week this is probably normal, if you are in last weeks of flowering this is what should happen

They look great, I'd be proud to have them in my garden! Those is normal for some fan leaves too turn yellow and purple, it's the "fall colours" and telling us the plant is nearly ready for harvest