Nvm I think I found the setting in comment customization - "highlight new comments". Not sure how it was determining what 'new' comments were though as it says it affects unread comments but it would continue to happen on posts I had read before, and sometimes wouldn't affect posts I had never seen. Or be mixed even on posts I had never seen. Anyway I'm not sure whether to delete this or leave it up for posterity, I guess the mods can decide.
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