I was affected by the initial SM "error", which was fixed for me yesterday. I had the "account number changed" issue as well as the derog. notation, causing my 103 point drop. But all is well as of today (no ScoreWatch email, but I pulled a new ScoreWatch report), I'm back up where I was, no duplicates.
So it appears to me as if the duplicates do not affect nearly as many people as the initial issue, which is good.