When creating a collection you can specify which columns to show. If you leave this blank ConfigMgr will use a default set of columns. In ConfigMgr 1511 however it will always revert back to the default columns...
When we specify which columns to show it should only show those.
E.G. have a collection of Windows 10 devices and the columns could show Name (name of the client) and OS build number (10240, 10586 or 1507, 1511 etc.)