I've got a few Chem D seedlings going now that have some weird leaf stuff going on, but not yellow
Hehe, I had one a while back, that had a branch, and later, a bud form, on a shade leaf. I uploaded the picture around here somewhere, and I couldn't help but leave it alone, to see what happened. I mean, once the shade leaf started to yellow near the end of flower, the branch went too, but it was so interesting I couldn't help myself lol. May have wasted some energy in that plant, but it was neat looking lol.
This one is an Ogre Kush x Banana OG F3 cross.
My guess is that Chem D is in their lineage somewhere, and it's just displaying that trait. Honestly that plant, may end up with some awesome smells bro