Users recorded as following a profile, but they have not followed.
Using Jamroom
Sorry I have only just seen your question on this, Brian.
I would expect there to be an unusually high number of followers at the end of May and June, because that is when the majority of members were transferring to the new site.
"How did you determine that all of the followers were added in 1 day?"
I looked at Janina's Followers list from the tab on her profile page. My understanding is that they are arranged in order of latest first - I did a quick check to confirm and I believe that's right.
I was looking for the user who had complained that day (12th November) about the false 'follow'. To my surprise, she appeared quite a long way down the list, on page 4 (16 followers per page). I checked a lot of those that came before her in the list, and all of their Timelines showed that they had followed Janina in the same day; at the time I looked, I think it said '12 hours ago', or about that.
This was true of all the ones I sampled until I reached the complainer's profile. I then looked beyond that profile and checked until I reached one that had followed a considerably longer time ago, which was the 150th in the list. Of the preceding 149, all of those I checked had the same time period on that 'follow' action on their Timelines. I have just looked at a few again now, and they all say they followed Janina "one week ago".
For example
http://pmp-art.com/lonetta-avelar has only one action on her Timeline that I can see, and it is that follow. Her profile appears on page 6 of Janina's followers.
Here's another,
http://pmp-art.com/linda-willason who is on p4 of the followers. I asked her by Private Note on 13th Nov, and she said she did not follow Janina.
This one
http://pmp-art.com/cindy-nowotny, I asked and she didn't follow Janina that day either, but thinks she might have followed her much earlier. Her timeline also shows following "one week ago", although she was travelling and not on site at that time.
So, it certainly seems plausible that it's a display issue.
Apologies for not explaining what I did. I have been trying to look for this information within long Timelines, but I can't get the Timeline Search to work in any way.