Context Capture Cesium Output floating above terrain

I have created a reality model using contextcapture and uploaded to a webserver. However when I open the model in the AppCCWebViewer2 it defaults to STK World Terrain Mesh and places the model in space. Changing the terrain type to WGS84 brings the model back down to earth but it is still floating hundred+ metres above the ground.

How can I fix this and also set the default terrain display so it is not in space?

Thanks