This geocache is part of the Murweh Triangle Geoart. It is NOT at the published coordinates. To find the cache, you need to work through the following.
I came across a rather cool video on YouTube talking about the strength of the Triangle once again, We visited this before at GC9WHBH and GC9WJM3
When you view this video, note what the SSS (three Ss) stand for at the conclusion of the video. Enter these into Certitude for your cache coordinates.
This is the Video
You can validate your puzzle solution with certitude.