Entirely off-topic, but why do some comments on HN have manual line breaks but most just soft-wrap? On my phone (Hacki app) each line is soft-wrapped, then hard

Entirely off-topic, but why do some comments on HN have manual line breaks but most just soft-wrap? On my phone (Hacki app) each line is soft-wrapped, then hard-wrapped after 1 or 2 words, which looks quite off