The way to reproduce an error:
1. Create new content type with userreference field
2. Create node of this content type
3. Add node author field and filter to show only nodes of freshly create type - view will correctly show node author name
4. Add relationship to userreference field to the view.
5. View will show the refered user instead of node author

Both views 6.x-2.2 and 6.x-2.x-dev shows the same error.