Facebbok Like Button

hello

I noticed today that the Facebook like button gets in the way of my top navigation bar?

The navigation bar kind of floats a top even when you scroll down on a page.

All other buttons are fine and hide behind the floating navigation bar.

Is this something that can be fixed or is it to do with facebook?

Thanks
Dean

http://wordpress.org/extend/plugins/hupso-share-buttons-for-twitter-facebook-google/