Different output when elevations data hosted on Tomcat and Node server

When i write below code and host .terrain files on Tomcat, i can correctly see elevations of an area:

var terrainProvider = new Cesium.CesiumTerrainProvider({      
  url: 'http://localhost:8080/terrain/terrain_52_06'
});
this.scene.terrainProvider = terrainProvider;

But, when i write below code and host .terrain files on nodejs server, i can see elevations of the area, but in addition to that i can see elevated spikes all over map on the globe also:

var terrainProvider = new Cesium.CesiumTerrainProvider({      
  url: 'http://localhost:3005/terrain/terrain_52_06'
});
this.scene.terrainProvider = terrainProvider;

Basically, my app runs on node server at: http://localhost:3005. So, in the Tomcat case, i enable CORS and then it works, whereas in Node server i dont need CORS.

via user6730740