I noticed this @ the beginning of my journey.
I just chalk it up to GOD's awesome sense of humour! Over the past 2 yrs of hair care I have come to know that these hairs are not damaged.
Through repeated trims and consistent DCing they still grow str8, strong & smooth. These str8 hairs are not in a particular spot on my head it's kinda random & sprinkled through out! I've got nappy patches with 2 str8 hairs in the middle LOL!
I expect the feel, texture & look of my hair to change dramatically (for the better) with continued care, but I don't ever expect completely uniformed textured hair.