I'm not sure I know what you mean - do you mean why the threads unbold themselves? I think the forum assumes you've read everything after you are logged on to the site a set amount of time. There may be a way to change this in your options - I'm not sure.
Just looked, and I don't see it.
But if you know when you left (check your last posts for a good idea) and you know when you came back (same), it shouldn't be that difficult to find the threads with activity in between those two dates.
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