Yikes! Who is editing my page? "Unknown" is NOT what I want to see!

I have a "Gold" wiki and am confused about how the different types of users work. I am a teacher in an elementary school and want to use it in the following ways:
1) Students can edit.
2) I will be notified when students edit and it will tell me who edited.
3) Nobody else can edit, but they can read.

I thought by adding users and setting them up as contributors or readers, this is how it would work. But I just received an email notification that someone "unknown" had edited the page. Based on the information edited, I knew which student it was, however, it didn't say his name. It just said "unknown". That makes me wonder if anyone can edit it. If so, have I set it up incorrectly?
 
indifferent I’m very concerned because my district could block the wiki if it's not "safe" for my students.
Inappropriate?

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