Liteon 5005 and Sky + and DVDshrink

Anyone Know why,

If I record from Sky+ HD to DVD+rw, then reauthor them on Computer with DVD
shrink In the right panel it always shows 2 copies of the movie file, Why?
If this is correct does it matter which I use or do I use both? I tried a test last night just selecting one of them and burned with nero 6 to dvd+rw all seemed ok
Played the Disc back on Computer using Nero Show Time Audio out of Sync, tried in liteon audio ok, tried in dvd drive of a cheap television and dvd combo
again fine

any ideas