Objects scale around the Anchor point in AE. You can move the Anchor Point to wherever you like. To move it select the layer. It will be the circle in the middle of the object. Then make sure you have the Anchor Point tool. Hit Y or go to the tools at the top of the program and click on the one that is next to the film camera that is a doted square box with a shape inside. Then click on the circle in the middle of your object and move it to where you want the shape to scale around.
Stephen Smith
Utah Video Productions
Check out my Vimeo page