I Need Help!

hi guys i need your help.
my plants are now in the 6th week of flower and 1 of my plants the biggest of them have very flyffy and airy buds and the leaves dont seem to be doing great, they are twisting straight down and i really dont know whats going on the other plants seem to be doing fine. can anyone help me plz?

thx

No info and no pics means no good diagnosis... what are your conditions? Kinda sounds like a heat problem, check for herms too.