Yeah I really think its a nitrogen problem I noticed the cha ching is 9 N so I'm hoping that solves the problem. Also the N defecieny falls in line with how I nuted them. I'm not used to growing an auto flower. But I fed nothing until week 3 and the plants were already showing pistols. At that point I started with tiger bloom, big bloom, and open sesame. They never got any grow big because they were already flowering by week 3. On top of that my first nute at 1/2 strength at 3 weeks old of tiger bloom, big bloom and open sesame the tips showed a little nute burn so I watered with regular water the next two waters. Which put them about 5 weeks/28 days old with only 1 nute of 1/2 strength. Then at about 6.5 weeks I watered with full strength tiger, big bloom, and beastie. In the next few days they showed the yellowing leaves. I flushed last week and then today just gave them a full tiger, big bloom, and cha ching. So they have had very little nutes in my opinion.