Spinner - http://addyosmani.github.com/jquery-ui-bootstrap/components.html#block-spinner
Other input (for example) - http://addyosmani.github.com/jquery-ui-bootstrap/components.html#autocomplete
I guess there is a problem with shadows (I quickly tested that commenting these lines of code produces a better result, but far from ideal).
and adding to the CSS the class ui-spinner-focused which is none other than the same focus of the other input (as in bootstrap).
I commented out, as said before, the "Input field styling from Bootstrap". How can this be fixed by default?
cc @gtraxx - what do you think? I would ideally like us to find a clean workaround for the issue. Appreciate you reporting it @Heliosmaster.