look at my video, put it in 720HD fullscreen.

id like to stretch down my audio wav to 4:42:10, and instead of decreasing my wav, it increase it!!! what the ?
is there anyone who can help me please?
http://www.youtube.com/watch?v=7apUIDJcdUA&feature=youtu.be
 
 
is it normal? i think not. it wasnt like that before.
the wave supposed to play faster but it play slower.