J4, again, without the file it's impossible for me to diagnose, but here are some comments. First, the Send to Surface command is primarily intended to move/place 3d Objects on the the surface of a Site Model. If you are using on a 2d Poly it *might* be causing the results you are seeing...
When working with Site Models, the recommended workflow is to use Site Modifiers (including Pads, Texture Beds, etc) to depict the 3d areas. You can also use Hybrid Objects (like Floors and Roof Faces, e.g.) which have the ability to show 2d Attributes like fills and hatches in 2d (top/plan) view and 3d Attributes like textures and colors in 3d views...
Feel free to PM (private message) me via this forum. Perhaps you can attach the file?