[Plugin: GD Star Rating] Additional half-star showing in chrome

Hi, can anyone help me?
I set the plugin to show ten stars, but there is an extra half-star displaying when I use google chrome. With mozilla and IE everything works fine.
This is the blog http://blog.comisiondeamigos.com.ar/top-10/
I would appreciate any help 🙂

http://wordpress.org/extend/plugins/gd-star-rating/