I think all curly hair does this. I have mainly 3c with a lot of 3b and some 4a sized curls, and some straight and wavy hairs sprinkled throughout. When I bun my hair it is straight/wavy all over. If your hair is in a stretched state for a period of time it's going to look like stretched out hair. Some people do this intentionally to stretch their hair to show length but I've never liked that look on me.
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