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I don't think I have the exact same problem but mine has not been working properly for months. After editing a predicted period to the actual dates the next month when I go to log again my last one is usually gone. I am irregular so its very difficult to remember when it was that is why I am using it. So it is very problematic. And useless at the moment. I keep trying thinking it will once again start working properly but I think I am fed up.
This is the same exact thing that's happening with mine. You are the only other person I have found with the same issue. I've been looking for over a month for an answer to this. I just turned my predictions of because it would be so frustrating.
