When I move the clone stamp over the image it moves the whole image and shows a duplicate image beneath. This is a new problem as i have used this tool often.
Thanks in advance for your help.
You probably have the Clone Source Overlay on.
Most people set it to clipped so you can still see a preview of the clone source or you can turn it off.
There is a button on the tool options bar to get to the clone source options:
thanks that was it