Displaying bug?

Hi!
Look at this picture and you know what I am saying:

http://img5.imageshack.us/img5/2900/e2rb.jpg

so the text filed got some problems and it doesn’t now display correctly.

Any idea how to fix, I tried to clear web cache and remove cookies but it still showing like that.

http://wordpress.org/extend/plugins/wp-sliding-login-register-panel/