Weird leaf growth

So I switched from 18/6 to 12/12 the youngest plant is 3 weeks maybe closer to 2.5 however the oldest plant is 30 days into veg. Not looking for a comment on how the yield will be lower i full understand that so I’ve decided to grow more plants to help grow my stash. My question is has anyone seen this before it looks like a stalk is forming from the center of a leaf?!?!
 

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So I switched from 18/6 to 12/12 the youngest plant is 3 weeks maybe closer to 2.5 however the oldest plant is 30 days into veg. Not looking for a comment on how the yield will be lower i full understand that so I’ve decided to grow more plants to help grow my stash. My question is has anyone seen this before it looks like a stalk is forming from the center of a leaf?!?!
Vernal chloros
So I switched from 18/6 to 12/12 the youngest plant is 3 weeks maybe closer to 2.5 however the oldest plant is 30 days into veg. Not looking for a comment on how the yield will be lower i full understand that so I’ve decided to grow more plants to help grow my stash. My question is has anyone seen this before it looks like a stalk is forming from the center of a leaf?!?!
Iron deficiency, (chlorosis)
 
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