CSS file not getting calling from page setting

System

Hi Techies,
I am observing strange behavior from .pages in SitePublisher, we have already associated 4 CSS files in page injected via page setting for each page. When the page is view sourced on actual live environment where page is hosted there I cannot see specific CSS (global.css) file but rest 3 are available under head section of rendered page.
I have done cache invalidation multiple times but in vain. Now I have updated page setting to reassociate that specific CSS file(global.css) twice on page and deployed to Production server then the head section started showing CSS link ref 2 times.

Can anyone tell how to solve this issue as I really dont want to manually update 500+ pages to reassociate (global.css) file and secondly there shouldnt be 2 calls for same file in page.

Please help

Manu G