Your map or layer's spatial reference (coordinate system) is different than the spatial reference required by the WGS 1984 Geographic Coordinate System tiling scheme. To overlay correctly with other web layers that use the WGS 1984 Geographic Coordinate System, your web layer must use the same spatial reference system.
Your web layer, the tiles generated for the cache, and all selected capabilities are in the WGS 1984 Geographic Coordinate System.
Note:
The coordinate system for the original map is not changed. The publishing process only changes the coordinate system for the web layer and uses this to create tiles for the cached web layer.
Solution
Do nothing. Your web layer uses the WGS 1984 Geographic Coordinate System, and you can overlay your web layer with other services using the WGS 1984 Geographic Coordinate System.
More information
All tiling schemes are associated with a spatial reference. Your map's spatial reference must match the spatial reference of your tiling scheme for tiles to be created.