When you first click on "My Flyertalk", the threads appearing there are only the ones that have updates since the last time you clicked into the thread. If you click into a thread, even if you don't get to it via "My Flyertalk", it no longer appears in that short list.

So with the example you provided, you must have already clicked into the first five threads in the "View All" list, even if you didn't get to them from "My Flyertalk".

Or at least, that's what I'm hoping has happened.