So I was browsing through the Michigan page when I noticed that there were some new pages that I didn't recognize, after being confused for a second I noticed "LAST UPDATE" and that it was 6/12/2017!
I also noticed the other new pages along with the updated that I made to some crossings in Monroe.
Unless this is from the current update (#856), I think Tommy is uploading a few pages for his next update. Unlike me, where I upload all of my pages the day of the update, Tommy prefers to upload them in the days prior, though he usually doesn't upload the state indexes this early, so I think it must've been a mistake.
Damn you Seth, I will impound that Delorean right now!
But yeah, David pretty much had it right. Because of my work schedule and the unpredictable internet at my apartment and my natural tendency to forget certain things, I like to upload stuff as I go. Since I was working on 2 separate states for this update, I uploaded all of my Michigan stuff first and then proceeded to Wisconsin. I always say if anyone finds the pages early, it's basically like a free Patreon getting early access.