strange mutant or???

has anyone seen this? all of the new growth on this plant since starting to flower has only 1 to 3 fingers per leaf. I'm not sure if I did something or what but it seems completely healthy in every other way I don't know whats up. maybe just the strain? it's a seed from a bag of really good midgrade I had a while ago.

this is my second grow ever it's under a 400w HPS now, but it was under CFL's. maybe the switch from CFL to HPS had something to do with it? temps don't go over 80. fox farm nutes, fox farm soil. it's in a 3gal pot.

Just the strain dude..had many plants do the same thing. They look great and healthy...I had plant before with only 3 leaves with potent buds when thy were done....no worries.