Some of my plants are growing faster?

[coralcactus]

So after my 3 week in defoliation I realised 3 of my girls are growing WAY ahead of the rest and when I say way ahead I mean....3 times bigger at least. The issue is they were all planted at the same time and all had the same nutrients and light the entire time.....so what can be causing this? Is it normal?

I’ve attached pics to show difference. can anyone tell me if the others will catch up in time for harvest in 4 weeks time?

[EDIT] they are all the same strain

 

[Ravski]

It could be down to different strain

 

[coralcactus]

They are all the same strain....this is what I don’t get

 

[Chris Scorpio]

Different pheno can be WAY different

Probably what yer seeing