Strain help and cause?

Growing
1

https://growithjane.com/growlog/green-crack-jawtv

This is my second grow of whatever this is. Lol. 2 questions below

  1. Can you identify the strain? It is either Green Crack or Jack Herer. When I popped the mother seeds I got them mixed up.

  2. Can you assist in why the leaves are turning brown and curling?