Man I had an auto strain that did something like that. I was told it was genetics, that the auto strains can do some funky shit sometimes. Very erratic. Don't worry.
If you are talking about the brown hairs in the middle of the pic, then u r completely fine. Those were some of the very first hairs this plant grew, and as such are the first to die off. Happens all the time. No worries. Looks good.