style doesn't reflect what's in css
Have you checked the css file route (Chrome will show that in the dev tool) that the website is reading? I use superfish as well, there are some css files for the menu bar in '.../sites/all/superfish/css/', but I also have my overriding style in my custom theme folder. Are you sure the browser is linking to the css file that you think it is linking to?

And, that happened to me once, probably is not your case, but I once forgot to save my css after editing it :P

Good luck.