Not sure where it comes from, but the worst outcome (if both work without problem) should be a 1-more-time cache miss, until both URLs are cached.

Thanks Olaf but I don't think it is related to caching as I always see this.
Even for the DEV forum I see both the flavor.
https://liferay.dev/combo?browserId=ie&minifierType=&themeId=osbcommunity_WAR_osbcommunitytheme&languageId=en_US&b=7102&com_liferay_message_boards_web_portlet_MBPortlet:%2Fmessage_boards%2Fcss%2Fmain.css&com_liferay_portal_search_web_search_bar_portlet_SearchBarPortlet_INSTANCE_templateSearch:%2Fsearch%2Fbar%2Fcss%2Fmain.css&com_liferay_product_navigation_product_menu_web_portlet_ProductMenuPortlet:%2Fcss%2Fmain.css&com_liferay_staging_bar_web_portlet_StagingBarPortlet:%2Fcss%2Fmain.css&t=1595624618000
https://liferay.dev/combo/?browserId=ie&minifierType=&languageId=en_US&b=7102&t=1595624536447&/o/frontend-js-web/liferay/language.js
Trying to determine if there is some setting which is controlling this.
Thanks
Abhay

If anyone can shed some light on this, it will be greatly appreciated.
Thanks