@Ebria, hey
Its a bit difficult to tell from this picture alone and the diary lacks detail.
- The soil looks a bit overwatered for the size of the plant. Stick your finger in the soil and check the first 5cm are dry before watering again. The pot should feel light when you lift it too.
- There seems to be a bit of rot too that can also be caused by overwatering
- 14 hours schedule is a bit too low. Autos grow better under 18-6 20-4 schedules. Still they can grow under 14 hours but the yield will be lower. I dont think that has anything to do with the yellowing
My best guess is that the plant was overwatered for too long.
With autos you really need to go with 18/6, 14 hours light and 10 of darkness just won't work with autos.
Grow photoperiod fems and forget autos if you want more control and much better results in future.
Overwatering, wrong ph or excessive nutritions and lockout, but i think you got rot too. Hard to tell from this photo, but if bud rot, start all over and dispose this plant safe and asap. I