How to remove scrollbars and cropped application layout ?
If you've got scrollbars in your fan page's shop tab or if you've got your application layout cropped, you have to modify your application settings like this:
Go to this URL : https://developers.facebook.com/apps/ as Facebook application's administrator and select your application.
Click on "Settings" button and choose theses values as below screenshot for "canvas width", "canvas height" and "page tab width":
After that you will get no more scrollbars in your fan page's shop tab and your application layout will no more cropped.