AutoComplete="off" is inconsistent

I have a website where a user can login from two different pages. I have set AutoComplete = "OFF" for the username and password textboxes in both t开发者_开发知识库he pages. But, surprisingly, autocompletion is disabled only in one page.!!! The other page still gives previous username suggestions.Is this feature really consistent? I have double checked hundred times. I'm doing no syntax error

Be sure that your browser or a plugin isn't configured to do that, above and beyond the browser's default behavior. Some password management features/plugins look deceptively similar to the browser's traditional autocompletion history, but are out of your markup's control.

How are you turning Autocomplete off? Have you tried

$("#yourSelector").autocomplete("destroy");