Top navigation style issue in settings.aspx SharePoint 2013

I had come up a strange issue after applying a custom master page to my SharePoint site.The Top navigation was showing correctly in all pages. But Site Settings page and site column page  were rendering differently than the rest of the site. Below steps helped me to resolve this issue.

1. Search for ID="PlaceHolderTopNavbar"

2. Bring  the Sharepoint:AspMenu control outside of this placeholder and delete asp:ContentPlaceHolder tag
   
Hope this helps...