EasyGrowGR

Could be a few things my guess ph of root zone, over fed or ec out of wack and even water frequency issues all could be an issue. Look into DLI , Vpd and ph. Ec with autos u cam follow a feeding schedule for autoflowers like fastbuds provides keeps nutrients mixed around 1/2 strength with auto. But that's just a few things to look into, Dr.bugbee on youtube has easy to understand videos. His indoor hemp production video explains the important inputs we can monitor. Best of luck, just takes alil to find ur routine autos can be tough to learn with.