Not a problem, I'm just curious:

When I enter my first FT area, say FT Miles, and pick a forum, I get yellow folders for those that have been changed since my last visit and blue for those that have not.

After I finish with FT miles and head over to FT travel, all the folders are blue - as if my last visit before this one was a minute ago.

When I return to FT miles the colors work right again.

This is not a big enough annoyance to be worth an effort to fix, but I'd like to know what the logic underneath is that makes it work this way.