Unread messages blue numbers appearing in Latest lately (when they shouldn't)?

[Jonathan5]

@Mevo

it represents “unread” messages

Here is a post I bookmarked yesterday. The blue circle is “new” and the grey one is “unread”:

@codinghorror

Grey means unread but not new. Posts you could have read the last time you were in the topic, but chose not to, for whatever reason.

Blue means new posts. There’s no way you could have read these posts, since they did not exist the last time you were in the topic.