Hi,
I downloaded a FDGC standard .style file with specific geology symbols to be used on a map I am creating. However, when I add it to my styles like in style manager, it clearly isnt the right symbols. Instead I end up with random generic symbols (screenshot is attached). I havent had issues adding ESRI styles before and they all continue to work fine.

I am using ArcDIS 10.3.1. Any help or insight would be greatly appreciated.
Thanks in advance.