Thanks for the response!
I tried this solution:
But I couldn't figure out how it can help.
I pressed and hold M, while in canvas, and left clicked and drag a blank part of the canvas. But, all I could see was the sprite being moved around.
The square that wraps the sprite and gives it a border didn't changed.
I even set a pivot, but I don't know if this will help.
Now, I'm reconstructing the sprite, using the body parts. I think this maneuver could solve the problem.