Why do my intaller class methods run on first execution?

Why do my installer class methods (install and commit) run on first execution?

This mean that it runs twice. One when I execute the setup program, and other when I execute the installed aplication shortcut.

And here is the point: This only happens for the shortcut. Not if I run the .exe directly.

When I inspect the shortcut target, I see that the shortcut that developer studio generates do not have the .exe file but only the path to the aplication folder.

What kind of behavior is this?

Thx!