As can be seen at http://technobabbl.es/wp-login.php?action=register (screenshot from Firefox 3.6.7 / Win7) the OpenID plugin adds a link to the registration form that messes up the label of the field following it.
The reason this happens is because that link is inside a paragraph that's floated left. Each
p element added by this plugin should have its CSS
clear: both; property set, or at least the first one should.
Note: I am using Fluency Admin but have tested this change both with and without Fluency enabled.