I'm puzzled by your description of the problem.
The clone tool works by first setting the source - Press Control then Left-Click-and-release
Then left-button and paint where you want the source copied to - the source brush outline follows the cursor movement.
When you then release the left-button the source resets to the initially selected position.
The clone tool works by first setting the source - Press Control then Left-Click-and-release
Then left-button and paint where you want the source copied to - the source brush outline follows the cursor movement.
When you then release the left-button the source resets to the initially selected position.