Natural hair help? Straight pieces!

Hey guys, so I've got natural hair. My hair type is about 3A-3B. Recently I've noticed some straight pieces amid my curls, like in the picture above on the right side. Also, I haven't used heat on my hair 13 months so it's definitely not heat damage (I don't blow dry, straighten, ect) and my hair has never been colored or chemically altered with a relaxer or perm.
Has anyone ever had this happen to them? What caused it/what did you do?
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