It's only in the upper growth most of the problems I've ran into are usually on bottom first. I'm no expert I've grown may 10/12 autos, but I think its immobile. Just not sure what. I'm thinking potassium or iron deficiency.
It's an auto and to be honest it started flowering at 2 weeks the plant is 35 days old. Everything else looks good. It's in happy frog soil with a mars ts1000 light.