Did you reinstall it twice? Were you getting two nortifications before a single reinstallation, and then three notifications afterwards? If not, the issue is not exactly as iffatall suggests, which is what my reply was intended to show.
There is no question that notifications are severely messed up in the recent versions of the app, and many of us have struggled with duplicate notifications. But iffatall seemed to think he had the problem identified as one notification for each installation of the app, and I don't think it is nearly that simple.