strange leaf formation ive never seen?

ok people, never seen this one before. any ideas?
the strain is plush berry and i noticed the mature leaves were throwing little leaves out of the center of the normal set of cannabis leaf fingers.
Ive had a 3 leaf kush before and 11 leaf varieties and inbetween but never seen this. its 2 days into flowering from 18/6.

out of the 10 plants, 3 of them are showing this type of trait. could it be something i caused by spraying foliar with b-1 supplement or genetics. seems cool anyways.

sorry for the crappy pics- i counted 13 or 14 leaves on it. some are under the leaves you see also and are tiny. plant is so dank and creamy smelling already

Something differnt first time i am seeing, what breed is that,
From where you got the seedlings...

have you used any superthrive on them recently, sometimes it does funky things to leafs..

i used blast-off which is a growth stimulant- lots of b-1 in a foliar spray. I found another thread where a guy was growing qleaner or something and had a similar issue with a mutant. the plant is healthy and this leaf is the fan leaf for a shoot.