Help please.im growing indoors (first one in years) ive got bruce banners in 3 gallon fabric bags im at the end of flowering 2 weeks to go,my plants were doing awesome ive had no loss or major issues,all of the sudden i have 3 plants that the buds are turning brown and dry when plant itself is green this happened over a two day period, i started to flush as scheduled after seeing this,they are still receiving co2, whats causes this and how do i stop it so i can get these babies over the finish line
. we will need more info and pics.