Actually this thread should go in the Suggestions forum, not the Networking forum when asking about things specifically for this site. Don't worry though, I've reported it to be moved.
But about your question.. it does come off as confusing but if you noticed, the first row is icons for new posts, the second row is for no new posts.
So when viewing the forums, if you see a red icon with letters sticking out, that means there are more than 15 replies or 150 posts along with it having new posts added since your last visit.
If there are no new posts since your last visit on a thread that has either 15 replies or 150 posts, it will appear as the blue mail icon with the dashes above it.
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