There should only be 2 extra files in the datagrid - security and fire breach videos. I do agree that they should not be here, but currently they are not filtered out.
As far as your duplicate entries, go to Media Browser in the web admin. Check the Title checkbox in the right pane, then click the Go button in the left pane. This will list all of your Title attributes. Find the title of one of your duplicated to drill down on it. Now on the new page, see if there are duplicate Filenames associated.. If I remember correctly, they will have a red "!" if they don't actually exist - you can then delete those ones.