Newbie - Clients showing up as servers?

First of all, I am not sure if this is the right forum and if it isn't, I apologize and would appreciate a point in the right direction.

We have Symantec Management Console 8.1. I have just gone into it for the first time and am trying to get the lay of the land.

First thing I noticed is that we have many Windows 7 (or machines marked with "Unknown Windows" listed under servers. Does the console automatically place computers in their proper group or was that done by one of my techs?

I appreciate your guidance.