I just made an account and linked it in BOINC. It downloaded and started running a large number of tasks, before I had even navigated to the page on here to set my project preferences. Now, the preferences changes I made are not reflected in what is running in BOINC, but BOINC will not let me remove the old project(s) since they are managed by the account manager instead.

well I figured it out, first I had to go into the BOINC manager menu and "Synchronize with Science United", then I manually aborted all the project tasks that I did not want. After that, the unwanted projects seem to have stopped downloading and running tasks.