I am going to guess that you are using something like
every tick -- set position of paddle to touch.x, y position
?
if so then when you don't have a touch in place then this would position the sprite at zero (ie no touch x position), y position.
So if I am guessing right then you could add something like
is in touch
every tick -- set position of paddle to touch.x, y position
As I said - total guess without the capx.
You can save your capx to dropbox and then post a link to that.