I imported new user using a plugin. After they were imported it showed that they had no status, so I selected all of the users on the first page and clicked the Bulk Check Sploggers button. That worked fine and everyone got a green "checked" status.
Then I went to the next page of users and did the same thing. This time, however, they all got a red Reported as Splogger status. So, thinking that I might have click the bulk report button by mistake, I went to the third page of users, selected them all and very carefully clicked the Bulk Check Sploggers button. The same thing happened, everyone was reported as a splogger.
I had to go through each one and click "Not a Splogger", which changed the status to Checked(forced). If I click recheck after that it says "reported as splogger". That means that WangGuard still considers them to be sploggers, even though they are not.